In JetBrains YouTrack before 2026.2.19197 reDoS attack was possible via mailbox regex mail-rule filters

cve CVE-2026-100267 2 sources, 2 claims · Watch

NVD writes:
In JetBrains YouTrack before 2026.2.19197 reDoS attack was possible via mailbox regex mail-rule filters the claim

Severity: medium GitHub advisories
MEDIUM NVD
CVSS: 5.9 GitHub advisories
5.9 NVD
Fixed in: 2026.2.19197 NVD
Vendor: JetBrains NVD
Product: YouTrack NVD
CWE: CWE-1333 GitHub advisories
CWE-1333 NVD

How far exploitation has got

No public code known
Proof of concept
Proof of concept, verified
A Metasploit module
Exploited in the wild
Used in ransomware campaigns

Timeline

2026-09-30	first spoke of it: In JetBrains YouTrack before 2026.2.19197 reDoS attack was possible via mailbox regex mail-rule...	GitHub advisories
2026-09-30	first spoke of it: In JetBrains YouTrack before 2026.2.19197 reDoS attack was possible via mailbox regex mail-rule filters	NVD

What it is to other things

affects	jetbrains/youtrack NVD
made_by	jetbrains NVD

Every value, with what each source said and its receipt

Property Source Said Means here

Automatable

automatable

NVD

At least one of those steps needs a person.

receipt

Source: NVD
Its words: no
Read by: field:cve.metrics.ssvcV203[].ssvcData.options[].automatable
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	no
2026-10-02 12:00 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "YouTrack",
            "vendor": "JetBrains",
            "versions": [
              {
                "lessThan": "2026.2.19197",
                "status": "affected",
                "version": "0",
                "versionType": "semver"
              }
            ]
          }
        ],
        "source": "cve@jetbrains.com"
      }
    ],
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
              {
                "criteria": "cpe:2.3:a:jetbrains:youtrack:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "3EC4E0A7-62BB-4635-B70A-154BB40F5FDC",
                "versionEndExcluding": "2026.2.19197",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "In JetBrains YouTrack before 2026.2.19197 reDoS attack was possible via mailbox regex mail-rule filters"
      }
    ],
    "id": "CVE-2026-100267",
    "lastModified": "2026-10-01T15:25:01.563",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.2,
          "impactScore": 3.6,
          "source": "cve@jetbrains.com",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-100267",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "partial"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-30T15:34:30.966300Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-30T16:16:57.853",
    "references": [
      {
        "source": "cve@jetbrains.com",
        "tags": [
          "Vendor Advisory"
        ],
        "url": "https://www.jetbrains.com/privacy-security/issues-fixed/"
      }
    ],
    "sourceIdentifier": "cve@jetbrains.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-1333"
          }
        ],
        "source": "cve@jetbrains.com",
        "type": "Primary"
      }
    ]
  }
}

—

CVSS

cvss

GitHub advisories

5.9

receipt

Source: GitHub advisories
Its words: 5.9
Read by: field:cvss.score
Said since: 2026-10-02 11:59 UTC
Last answered: 2026-10-06 13:46 UTC
Original: open at the source

What the source handed over

{
  "credits": [],
  "cve_id": "CVE-2026-100267",
  "cvss": {
    "score": 5.9,
    "vector_string": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"
  },
  "cvss_severities": {
    "cvss_v3": {
      "score": 5.9,
      "vector_string": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"
    },
    "cvss_v4": {
      "score": 0.0,
      "vector_string": null
    }
  },
  "cwes": [
    {
      "cwe_id": "CWE-1333",
      "name": "Inefficient Regular Expression Complexity"
    }
  ],
  "description": "In JetBrains YouTrack before 2026.2.19197 reDoS attack was possible via mailbox regex mail-rule filters",
  "epss": {
    "percentage": 0.00367,
    "percentile": 0.28149
  },
  "ghsa_id": "GHSA-h6p5-g44x-3r85",
  "github_reviewed_at": null,
  "html_url": "https://github.com/advisories/GHSA-h6p5-g44x-3r85",
  "identifiers": [
    {
      "type": "GHSA",
      "value": "GHSA-h6p5-g44x-3r85"
    },
    {
      "type": "CVE",
      "value": "CVE-2026-100267"
    }
  ],
  "nvd_published_at": "2026-09-30T16:16:57Z",
  "published_at": "2026-09-30T18:33:30Z",
  "references": [
    "https://nvd.nist.gov/vuln/detail/CVE-2026-100267",
    "https://www.jetbrains.com/privacy-security/issues-fixed",
    "https://github.com/advisories/GHSA-h6p5-g44x-3r85"
  ],
  "repository_advisory_url": null,
  "severity": "medium",
  "source_code_location": "",
  "summary": "In JetBrains YouTrack before 2026.2.19197 reDoS attack was possible via mailbox regex mail-rule...",
  "type": "unreviewed",
  "updated_at": "2026-09-30T18:33:31Z",
  "url": "https://api.github.com/advisories/GHSA-h6p5-g44x-3r85",
  "vulnerabilities": [],
  "withdrawn_at": null
}

—

CVSS

cvss

NVD

5.9

receipt

Source: NVD
Its words: 5.9
Read by: field:cve.metrics.cvssMetricV31[type=Primary].cvssData.baseScore || field:cve.metrics.cvssMetricV31[].cvssData.baseScore
Said since: 2026-10-02 12:00 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "YouTrack",
            "vendor": "JetBrains",
            "versions": [
              {
                "lessThan": "2026.2.19197",
                "status": "affected",
                "version": "0",
                "versionType": "semver"
              }
            ]
          }
        ],
        "source": "cve@jetbrains.com"
      }
    ],
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
              {
                "criteria": "cpe:2.3:a:jetbrains:youtrack:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "3EC4E0A7-62BB-4635-B70A-154BB40F5FDC",
                "versionEndExcluding": "2026.2.19197",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "In JetBrains YouTrack before 2026.2.19197 reDoS attack was possible via mailbox regex mail-rule filters"
      }
    ],
    "id": "CVE-2026-100267",
    "lastModified": "2026-10-01T15:25:01.563",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.2,
          "impactScore": 3.6,
          "source": "cve@jetbrains.com",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-100267",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "partial"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-30T15:34:30.966300Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-30T16:16:57.853",
    "references": [
      {
        "source": "cve@jetbrains.com",
        "tags": [
          "Vendor Advisory"
        ],
        "url": "https://www.jetbrains.com/privacy-security/issues-fixed/"
      }
    ],
    "sourceIdentifier": "cve@jetbrains.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
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            "value": "CWE-1333"
          }
        ],
        "source": "cve@jetbrains.com",
        "type": "Primary"
      }
    ]
  }
}

—

CVSS vector

cvss_vector

NVD

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

receipt

Source: NVD
Its words: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Read by: field:cve.metrics.cvssMetricV31[type=Primary].cvssData.vectorString || field:cve.metrics.cvssMetricV31[].cvssData.vectorString
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
2026-10-02 12:00 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "YouTrack",
            "vendor": "JetBrains",
            "versions": [
              {
                "lessThan": "2026.2.19197",
                "status": "affected",
                "version": "0",
                "versionType": "semver"
              }
            ]
          }
        ],
        "source": "cve@jetbrains.com"
      }
    ],
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
              {
                "criteria": "cpe:2.3:a:jetbrains:youtrack:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "3EC4E0A7-62BB-4635-B70A-154BB40F5FDC",
                "versionEndExcluding": "2026.2.19197",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "In JetBrains YouTrack before 2026.2.19197 reDoS attack was possible via mailbox regex mail-rule filters"
      }
    ],
    "id": "CVE-2026-100267",
    "lastModified": "2026-10-01T15:25:01.563",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.2,
          "impactScore": 3.6,
          "source": "cve@jetbrains.com",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-100267",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "partial"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-30T15:34:30.966300Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-30T16:16:57.853",
    "references": [
      {
        "source": "cve@jetbrains.com",
        "tags": [
          "Vendor Advisory"
        ],
        "url": "https://www.jetbrains.com/privacy-security/issues-fixed/"
      }
    ],
    "sourceIdentifier": "cve@jetbrains.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-1333"
          }
        ],
        "source": "cve@jetbrains.com",
        "type": "Primary"
      }
    ]
  }
}

—

CWE

cwe

GitHub advisories

CWE-1333

receipt

Source: GitHub advisories
Its words: CWE-1333
Read by: field:cwes[].cwe_id
Said since: 2026-10-02 11:59 UTC
Last answered: 2026-10-06 13:46 UTC
Original: open at the source

What the source handed over

{
  "credits": [],
  "cve_id": "CVE-2026-100267",
  "cvss": {
    "score": 5.9,
    "vector_string": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"
  },
  "cvss_severities": {
    "cvss_v3": {
      "score": 5.9,
      "vector_string": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"
    },
    "cvss_v4": {
      "score": 0.0,
      "vector_string": null
    }
  },
  "cwes": [
    {
      "cwe_id": "CWE-1333",
      "name": "Inefficient Regular Expression Complexity"
    }
  ],
  "description": "In JetBrains YouTrack before 2026.2.19197 reDoS attack was possible via mailbox regex mail-rule filters",
  "epss": {
    "percentage": 0.00367,
    "percentile": 0.28149
  },
  "ghsa_id": "GHSA-h6p5-g44x-3r85",
  "github_reviewed_at": null,
  "html_url": "https://github.com/advisories/GHSA-h6p5-g44x-3r85",
  "identifiers": [
    {
      "type": "GHSA",
      "value": "GHSA-h6p5-g44x-3r85"
    },
    {
      "type": "CVE",
      "value": "CVE-2026-100267"
    }
  ],
  "nvd_published_at": "2026-09-30T16:16:57Z",
  "published_at": "2026-09-30T18:33:30Z",
  "references": [
    "https://nvd.nist.gov/vuln/detail/CVE-2026-100267",
    "https://www.jetbrains.com/privacy-security/issues-fixed",
    "https://github.com/advisories/GHSA-h6p5-g44x-3r85"
  ],
  "repository_advisory_url": null,
  "severity": "medium",
  "source_code_location": "",
  "summary": "In JetBrains YouTrack before 2026.2.19197 reDoS attack was possible via mailbox regex mail-rule...",
  "type": "unreviewed",
  "updated_at": "2026-09-30T18:33:31Z",
  "url": "https://api.github.com/advisories/GHSA-h6p5-g44x-3r85",
  "vulnerabilities": [],
  "withdrawn_at": null
}

—

CWE

cwe

NVD

CWE-1333

receipt

Source: NVD
Its words: CWE-1333
Read by: field:cve.weaknesses[].description[].value
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	CWE-1333
2026-10-02 12:00 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "YouTrack",
            "vendor": "JetBrains",
            "versions": [
              {
                "lessThan": "2026.2.19197",
                "status": "affected",
                "version": "0",
                "versionType": "semver"
              }
            ]
          }
        ],
        "source": "cve@jetbrains.com"
      }
    ],
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
              {
                "criteria": "cpe:2.3:a:jetbrains:youtrack:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "3EC4E0A7-62BB-4635-B70A-154BB40F5FDC",
                "versionEndExcluding": "2026.2.19197",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "In JetBrains YouTrack before 2026.2.19197 reDoS attack was possible via mailbox regex mail-rule filters"
      }
    ],
    "id": "CVE-2026-100267",
    "lastModified": "2026-10-01T15:25:01.563",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.2,
          "impactScore": 3.6,
          "source": "cve@jetbrains.com",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-100267",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "partial"
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            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-30T15:34:30.966300Z",
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    },
    "published": "2026-09-30T16:16:57.853",
    "references": [
      {
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        "tags": [
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        ],
        "url": "https://www.jetbrains.com/privacy-security/issues-fixed/"
      }
    ],
    "sourceIdentifier": "cve@jetbrains.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-1333"
          }
        ],
        "source": "cve@jetbrains.com",
        "type": "Primary"
      }
    ]
  }
}

—

Exploitation

exploitation

NVD

none

No evidence of exploitation, and no public proof of concept.

receipt

Source: NVD
Its words: none
Read by: field:cve.metrics.ssvcV203[].ssvcData.options[].exploitation
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	none
2026-10-02 12:00 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "YouTrack",
            "vendor": "JetBrains",
            "versions": [
              {
                "lessThan": "2026.2.19197",
                "status": "affected",
                "version": "0",
                "versionType": "semver"
              }
            ]
          }
        ],
        "source": "cve@jetbrains.com"
      }
    ],
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
              {
                "criteria": "cpe:2.3:a:jetbrains:youtrack:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "3EC4E0A7-62BB-4635-B70A-154BB40F5FDC",
                "versionEndExcluding": "2026.2.19197",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "In JetBrains YouTrack before 2026.2.19197 reDoS attack was possible via mailbox regex mail-rule filters"
      }
    ],
    "id": "CVE-2026-100267",
    "lastModified": "2026-10-01T15:25:01.563",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.2,
          "impactScore": 3.6,
          "source": "cve@jetbrains.com",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-100267",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "partial"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-30T15:34:30.966300Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-30T16:16:57.853",
    "references": [
      {
        "source": "cve@jetbrains.com",
        "tags": [
          "Vendor Advisory"
        ],
        "url": "https://www.jetbrains.com/privacy-security/issues-fixed/"
      }
    ],
    "sourceIdentifier": "cve@jetbrains.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-1333"
          }
        ],
        "source": "cve@jetbrains.com",
        "type": "Primary"
      }
    ]
  }
}

—

Fixed in

fixed_in

NVD

2026.2.19197

receipt

Source: NVD
Its words: 2026.2.19197
Read by: field:cve.affected[].affectedData[].versions[status=affected].lessThan
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	2026.2.19197
2026-10-02 12:00 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "YouTrack",
            "vendor": "JetBrains",
            "versions": [
              {
                "lessThan": "2026.2.19197",
                "status": "affected",
                "version": "0",
                "versionType": "semver"
              }
            ]
          }
        ],
        "source": "cve@jetbrains.com"
      }
    ],
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
              {
                "criteria": "cpe:2.3:a:jetbrains:youtrack:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "3EC4E0A7-62BB-4635-B70A-154BB40F5FDC",
                "versionEndExcluding": "2026.2.19197",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "In JetBrains YouTrack before 2026.2.19197 reDoS attack was possible via mailbox regex mail-rule filters"
      }
    ],
    "id": "CVE-2026-100267",
    "lastModified": "2026-10-01T15:25:01.563",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.2,
          "impactScore": 3.6,
          "source": "cve@jetbrains.com",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-100267",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "partial"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-30T15:34:30.966300Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-30T16:16:57.853",
    "references": [
      {
        "source": "cve@jetbrains.com",
        "tags": [
          "Vendor Advisory"
        ],
        "url": "https://www.jetbrains.com/privacy-security/issues-fixed/"
      }
    ],
    "sourceIdentifier": "cve@jetbrains.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-1333"
          }
        ],
        "source": "cve@jetbrains.com",
        "type": "Primary"
      }
    ]
  }
}

—

Product

product

NVD

YouTrack

receipt

Source: NVD
Its words: YouTrack
Read by: field:cve.affected[].affectedData[].product
Said since: 2026-10-02 12:00 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "YouTrack",
            "vendor": "JetBrains",
            "versions": [
              {
                "lessThan": "2026.2.19197",
                "status": "affected",
                "version": "0",
                "versionType": "semver"
              }
            ]
          }
        ],
        "source": "cve@jetbrains.com"
      }
    ],
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
              {
                "criteria": "cpe:2.3:a:jetbrains:youtrack:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "3EC4E0A7-62BB-4635-B70A-154BB40F5FDC",
                "versionEndExcluding": "2026.2.19197",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "In JetBrains YouTrack before 2026.2.19197 reDoS attack was possible via mailbox regex mail-rule filters"
      }
    ],
    "id": "CVE-2026-100267",
    "lastModified": "2026-10-01T15:25:01.563",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.2,
          "impactScore": 3.6,
          "source": "cve@jetbrains.com",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-100267",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "partial"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-30T15:34:30.966300Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-30T16:16:57.853",
    "references": [
      {
        "source": "cve@jetbrains.com",
        "tags": [
          "Vendor Advisory"
        ],
        "url": "https://www.jetbrains.com/privacy-security/issues-fixed/"
      }
    ],
    "sourceIdentifier": "cve@jetbrains.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-1333"
          }
        ],
        "source": "cve@jetbrains.com",
        "type": "Primary"
      }
    ]
  }
}

—

Severity

severity

GitHub advisories

medium

receipt

Source: GitHub advisories
Its words: medium
Read by: field:severity
Said since: 2026-10-02 11:59 UTC
Last answered: 2026-10-06 13:46 UTC
Original: open at the source

What the source handed over

{
  "credits": [],
  "cve_id": "CVE-2026-100267",
  "cvss": {
    "score": 5.9,
    "vector_string": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"
  },
  "cvss_severities": {
    "cvss_v3": {
      "score": 5.9,
      "vector_string": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"
    },
    "cvss_v4": {
      "score": 0.0,
      "vector_string": null
    }
  },
  "cwes": [
    {
      "cwe_id": "CWE-1333",
      "name": "Inefficient Regular Expression Complexity"
    }
  ],
  "description": "In JetBrains YouTrack before 2026.2.19197 reDoS attack was possible via mailbox regex mail-rule filters",
  "epss": {
    "percentage": 0.00367,
    "percentile": 0.28149
  },
  "ghsa_id": "GHSA-h6p5-g44x-3r85",
  "github_reviewed_at": null,
  "html_url": "https://github.com/advisories/GHSA-h6p5-g44x-3r85",
  "identifiers": [
    {
      "type": "GHSA",
      "value": "GHSA-h6p5-g44x-3r85"
    },
    {
      "type": "CVE",
      "value": "CVE-2026-100267"
    }
  ],
  "nvd_published_at": "2026-09-30T16:16:57Z",
  "published_at": "2026-09-30T18:33:30Z",
  "references": [
    "https://nvd.nist.gov/vuln/detail/CVE-2026-100267",
    "https://www.jetbrains.com/privacy-security/issues-fixed",
    "https://github.com/advisories/GHSA-h6p5-g44x-3r85"
  ],
  "repository_advisory_url": null,
  "severity": "medium",
  "source_code_location": "",
  "summary": "In JetBrains YouTrack before 2026.2.19197 reDoS attack was possible via mailbox regex mail-rule...",
  "type": "unreviewed",
  "updated_at": "2026-09-30T18:33:31Z",
  "url": "https://api.github.com/advisories/GHSA-h6p5-g44x-3r85",
  "vulnerabilities": [],
  "withdrawn_at": null
}

—

Severity

severity

NVD

MEDIUM

From 4.0 to 6.9.

receipt

Source: NVD
Its words: MEDIUM
Read by: field:cve.metrics.cvssMetricV31[type=Primary].cvssData.baseSeverity || field:cve.metrics.cvssMetricV31[].cvssData.baseSeverity
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	MEDIUM
2026-10-02 12:00 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "YouTrack",
            "vendor": "JetBrains",
            "versions": [
              {
                "lessThan": "2026.2.19197",
                "status": "affected",
                "version": "0",
                "versionType": "semver"
              }
            ]
          }
        ],
        "source": "cve@jetbrains.com"
      }
    ],
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
              {
                "criteria": "cpe:2.3:a:jetbrains:youtrack:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "3EC4E0A7-62BB-4635-B70A-154BB40F5FDC",
                "versionEndExcluding": "2026.2.19197",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "In JetBrains YouTrack before 2026.2.19197 reDoS attack was possible via mailbox regex mail-rule filters"
      }
    ],
    "id": "CVE-2026-100267",
    "lastModified": "2026-10-01T15:25:01.563",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.2,
          "impactScore": 3.6,
          "source": "cve@jetbrains.com",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-100267",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "partial"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-30T15:34:30.966300Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-30T16:16:57.853",
    "references": [
      {
        "source": "cve@jetbrains.com",
        "tags": [
          "Vendor Advisory"
        ],
        "url": "https://www.jetbrains.com/privacy-security/issues-fixed/"
      }
    ],
    "sourceIdentifier": "cve@jetbrains.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-1333"
          }
        ],
        "source": "cve@jetbrains.com",
        "type": "Primary"
      }
    ]
  }
}

medium

Status

status

NVD

Analyzed

receipt

Source: NVD
Its words: Analyzed
Read by: field:cve.vulnStatus
Said since: 2026-10-02 12:00 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "YouTrack",
            "vendor": "JetBrains",
            "versions": [
              {
                "lessThan": "2026.2.19197",
                "status": "affected",
                "version": "0",
                "versionType": "semver"
              }
            ]
          }
        ],
        "source": "cve@jetbrains.com"
      }
    ],
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
              {
                "criteria": "cpe:2.3:a:jetbrains:youtrack:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "3EC4E0A7-62BB-4635-B70A-154BB40F5FDC",
                "versionEndExcluding": "2026.2.19197",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "In JetBrains YouTrack before 2026.2.19197 reDoS attack was possible via mailbox regex mail-rule filters"
      }
    ],
    "id": "CVE-2026-100267",
    "lastModified": "2026-10-01T15:25:01.563",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.2,
          "impactScore": 3.6,
          "source": "cve@jetbrains.com",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-100267",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "partial"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-30T15:34:30.966300Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-30T16:16:57.853",
    "references": [
      {
        "source": "cve@jetbrains.com",
        "tags": [
          "Vendor Advisory"
        ],
        "url": "https://www.jetbrains.com/privacy-security/issues-fixed/"
      }
    ],
    "sourceIdentifier": "cve@jetbrains.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-1333"
          }
        ],
        "source": "cve@jetbrains.com",
        "type": "Primary"
      }
    ]
  }
}

—

Technical impact

technical_impact

NVD

partial

The attacker gains limited control, or limited information.

receipt

Source: NVD
Its words: partial
Read by: field:cve.metrics.ssvcV203[].ssvcData.options[].technicalImpact
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	partial
2026-10-02 12:00 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "YouTrack",
            "vendor": "JetBrains",
            "versions": [
              {
                "lessThan": "2026.2.19197",
                "status": "affected",
                "version": "0",
                "versionType": "semver"
              }
            ]
          }
        ],
        "source": "cve@jetbrains.com"
      }
    ],
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
              {
                "criteria": "cpe:2.3:a:jetbrains:youtrack:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "3EC4E0A7-62BB-4635-B70A-154BB40F5FDC",
                "versionEndExcluding": "2026.2.19197",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "In JetBrains YouTrack before 2026.2.19197 reDoS attack was possible via mailbox regex mail-rule filters"
      }
    ],
    "id": "CVE-2026-100267",
    "lastModified": "2026-10-01T15:25:01.563",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.2,
          "impactScore": 3.6,
          "source": "cve@jetbrains.com",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-100267",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "partial"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-30T15:34:30.966300Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-30T16:16:57.853",
    "references": [
      {
        "source": "cve@jetbrains.com",
        "tags": [
          "Vendor Advisory"
        ],
        "url": "https://www.jetbrains.com/privacy-security/issues-fixed/"
      }
    ],
    "sourceIdentifier": "cve@jetbrains.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-1333"
          }
        ],
        "source": "cve@jetbrains.com",
        "type": "Primary"
      }
    ]
  }
}

—

Vendor

vendor

NVD

JetBrains

receipt

Source: NVD
Its words: JetBrains
Read by: field:cve.affected[].affectedData[].vendor
Said since: 2026-10-02 12:00 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "YouTrack",
            "vendor": "JetBrains",
            "versions": [
              {
                "lessThan": "2026.2.19197",
                "status": "affected",
                "version": "0",
                "versionType": "semver"
              }
            ]
          }
        ],
        "source": "cve@jetbrains.com"
      }
    ],
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
              {
                "criteria": "cpe:2.3:a:jetbrains:youtrack:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "3EC4E0A7-62BB-4635-B70A-154BB40F5FDC",
                "versionEndExcluding": "2026.2.19197",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "In JetBrains YouTrack before 2026.2.19197 reDoS attack was possible via mailbox regex mail-rule filters"
      }
    ],
    "id": "CVE-2026-100267",
    "lastModified": "2026-10-01T15:25:01.563",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.2,
          "impactScore": 3.6,
          "source": "cve@jetbrains.com",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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              },
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                "automatable": "no"
              },
              {
                "technicalImpact": "partial"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-30T15:34:30.966300Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-30T16:16:57.853",
    "references": [
      {
        "source": "cve@jetbrains.com",
        "tags": [
          "Vendor Advisory"
        ],
        "url": "https://www.jetbrains.com/privacy-security/issues-fixed/"
      }
    ],
    "sourceIdentifier": "cve@jetbrains.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-1333"
          }
        ],
        "source": "cve@jetbrains.com",
        "type": "Primary"
      }
    ]
  }
}

—

Every claim, by kind

vulnerability

In JetBrains YouTrack before 2026.2.19197 reDoS attack was possible via mailbox regex mail-rule filters zetlyn/cve-nvd · 2026-09-30	automatable no cvss 5.9 cvss_vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H cwe CWE-1333 exploitation none fixed_in 2026.2.19197 product YouTrack severity MEDIUM status Analyzed technical_impact partial vendor JetBrains	source
In JetBrains YouTrack before 2026.2.19197 reDoS attack was possible via mailbox regex mail-rule... zetlyn/cve-ghsa · 2026-09-30	cvss 5.9 cwe CWE-1333 severity medium	source