A flaw was found in tnef. An attacker can exploit this vulnerability by providing a specially crafted file containing uncompressed Rich Text Format (RTF) data. Because the application fails to properly validate input buffer boundaries before copying data in get_rtf_data_from_buf(), reading beyond the allocated memory occurs. This flaw can cause the application to crash, leading to a Denial of Service (DoS), or leak sensitive memory contents into extracted output files.

zetlyn/cve-nvd vulnerability cve CVE-2026-103678 cpe cpe:2.3:a:tnef_project:tnef:*:*:*:*:*:*:*:* known 2026-10-01

https://nvd.nist.gov/vuln/detail/CVE-2026-103678

Properties

automatable

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

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cvss

8.1

receipt

Source: NVD
Its words: 8.1
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Said since: 2026-10-06 11:32 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 11:32 UTC	8.1
2026-10-02 12:00 UTC	5.4

What the source handed over

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cvss_vector

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

receipt

Source: NVD
Its words: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/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:L/PR:N/UI:R/S:U/C:H/I:N/A:H
2026-10-02 12:00 UTC	—

What the source handed over

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cwe

CWE-125

receipt

Source: NVD
Its words: CWE-125
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-125
2026-10-02 12:00 UTC	—

What the source handed over

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}

exploitation

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

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            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L",
            "version": "3.1"
          },
          "exploitabilityScore": 2.8,
          "impactScore": 2.5,
          "source": "patrick@puiterwijk.org",
          "type": "Secondary"
        },
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.8,
          "impactScore": 5.2,
          "source": "nvd@nist.gov",
          "type": "Primary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-103678",
            "options": [
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                "exploitation": "none"
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                "automatable": "no"
              },
              {
                "technicalImpact": "partial"
              }
            ],
            "role": "CISA Coordinator",
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        "url": "https://access.redhat.com/security/cve/CVE-2026-103678"
      },
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      },
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        "tags": [
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        "type": "Secondary"
      }
    ]
  }
}

severity

HIGH

From 7.0 to 8.9.

receipt

Source: NVD
Its words: HIGH
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	HIGH
2026-10-02 12:00 UTC	—

What the source handed over

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    ],
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    ],
    "id": "CVE-2026-103678",
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          "impactScore": 5.2,
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          "type": "Primary"
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      ],
      "ssvcV203": [
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      },
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        "tags": [
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    "vulnStatus": "Analyzed",
    "weaknesses": [
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        "type": "Secondary"
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    ]
  }
}

status

Analyzed

receipt

Source: NVD
Its words: Analyzed
Read by: field:cve.vulnStatus
Said since: 2026-10-05 18:25 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-05 18:25 UTC	Analyzed
2026-10-02 12:00 UTC	Undergoing Analysis

What the source handed over

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      {
        "affectedData": [
          {
            "collectionURL": "https://github.com/verdammelt/tnef",
            "defaultStatus": "unaffected",
            "packageName": "tnef",
            "versions": [
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      }
    ],
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    "lastModified": "2026-10-05T14:25:05.183",
    "metrics": {
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            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L",
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          "source": "patrick@puiterwijk.org",
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        },
        {
          "cvssData": {
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            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H",
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          },
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          "impactScore": 5.2,
          "source": "nvd@nist.gov",
          "type": "Primary"
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      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
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            "options": [
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                "exploitation": "none"
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              {
                "automatable": "no"
              },
              {
                "technicalImpact": "partial"
              }
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    "references": [
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        "tags": [
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        "type": "Secondary"
      }
    ]
  }
}

technical_impact

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

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      {
        "affectedData": [
          {
            "collectionURL": "https://github.com/verdammelt/tnef",
            "defaultStatus": "unaffected",
            "packageName": "tnef",
            "versions": [
              {
                "lessThanOrEqual": "1.4.18",
                "status": "affected",
                "version": "0",
                "versionType": "semver"
              }
            ]
          }
        ],
        "source": "patrick@puiterwijk.org"
      }
    ],
    "configurations": [
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                "versionEndIncluding": "1.4.18",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
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      }
    ],
    "id": "CVE-2026-103678",
    "lastModified": "2026-10-05T14:25:05.183",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
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            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
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        },
        {
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          },
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          "source": "nvd@nist.gov",
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        }
      ],
      "ssvcV203": [
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        "type": "Secondary"
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  }
}

Text

A flaw was found in tnef. An attacker can exploit this vulnerability by providing a specially crafted file containing uncompressed Rich Text Format (RTF) data. Because the application fails to properly validate input buffer boundaries before copying data in get_rtf_data_from_buf(), reading beyond the allocated memory occurs. This flaw can cause the application to crash, leading to a Denial of Service (DoS), or leak sensitive memory contents into extracted output files.