libcurl: libcurl: Use-after-free vulnerability leading to Denial of Service

cve CVE-2026-10536 2 sources, 2 claims · Watch

Red Hat writes:
libcurl: libcurl: Use-after-free vulnerability leading to Denial of Service the claim

Severity they disagree: CRITICAL NVD
moderate Red Hat
CVSS they disagree: 9.8 NVD
4.7 Red Hat
Fixed in: 8.14.2, 8.16.1, 8.20.1 NVD
Vendor: curl NVD
Product: curl NVD
CWE: CWE-416 NVD
CWE-825 Red Hat

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

Why the CVSS differs

Metric	NVD	Red Hat
Attack vector AV	network N	local L
Attack complexity AC	low L	high H
Privileges required PR	none N	low L
User interaction UI	none N	none N
Scope S	unchanged U	unchanged U
Confidentiality C	high H	none N
Integrity I	high H	none N
Availability A	high H	high H

Each source scores the same vulnerability from what it judges the attack to need. The rows marked are where they judge it differently.

Timeline

2026-07-03	first spoke of it: A use-after-free vulnerability exists in libcurl when an application configures an HTTP/2 stream-dependency tree via `CURLOPT_STREAM_DEPENDS` or `CURLOPT_STREAM_DEPENDS_E`, subsequently invokes `curl_easy_reset()`, and finally terminates the handle with `curl_easy_cleanup()`. During this final cleanup phase, libcurl attempts to access and modify an internal structure that was already freed during the reset operation.	NVD
2026-07-03	first spoke of it: libcurl: libcurl: Use-after-free vulnerability leading to Denial of Service	Red Hat

What it is to other things

affects	haxx/curl NVD
made_by	haxx NVD

In words only, so not counted until a person confirms one:

made_by	`curl` NVD says “curl”
affects	`curl/curl` NVD says “curl · curl”

Every value, with what each source said and its receipt

Property Source Said Means here

Automatable

automatable

NVD

yes

An attacker can reliably run all of the kill chain's first four steps without a person.

receipt

Source: NVD
Its words: yes
Read by: field:cve.metrics.ssvcV203[].ssvcData.options[].automatable
Said since: 2026-10-06 12:29 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:29 UTC	yes
2026-09-29 09:45 UTC	—

What the source handed over

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      }
    ]
  }
}

—

CVSS

cvss

conflict

NVD

9.8

receipt

Source: NVD
Its words: 9.8
Read by: field:cve.metrics.cvssMetricV31[type=Primary].cvssData.baseScore || field:cve.metrics.cvssMetricV31[].cvssData.baseScore
Said since: 2026-09-29 09:45 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

What the source handed over

{
  "cve": {
    "affected": [
      {
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          {
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            "vendor": "curl",
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                "versionType": "semver"
              },
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                "versionType": "semver"
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            ]
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            "vendor": "curl",
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}

—

CVSS

cvss

conflict

Red Hat

4.7

receipt

Source: Red Hat
Its words: 4.7
Read by: field:cvss3_score
Said since: 2026-09-29 09:44 UTC
Last answered: 2026-10-06 13:02 UTC
Original: open at the source

What the source handed over

{
  "CVE": "CVE-2026-10536",
  "CWE": "CWE-825",
  "advisories": [
    "RHSA-2026:41240"
  ],
  "affected_packages": [
    "curl-main-8.21.0-0.1.1.hum1"
  ],
  "bugzilla": "2496766",
  "bugzilla_description": "libcurl: libcurl: Use-after-free vulnerability leading to Denial of Service",
  "cvss3_score": "4.7",
  "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2026-07-03T06:11:15Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-10536.json",
  "severity": "moderate"
}

—

CVSS vector

cvss_vector

not compared

NVD

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

receipt

Source: NVD
Its words: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Read by: field:cve.metrics.cvssMetricV31[type=Primary].cvssData.vectorString || field:cve.metrics.cvssMetricV31[].cvssData.vectorString
Said since: 2026-10-06 12:29 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:29 UTC	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
2026-09-29 09:45 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "curl",
            "vendor": "curl",
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                "status": "affected",
                "version": "7.88.0",
                "versionType": "semver"
              },
              {
                "lessThan": "8.16.1",
                "status": "affected",
                "version": "8.15.0",
                "versionType": "semver"
              },
              {
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            "vendor": "curl",
            "versions": [
              {
                "lessThan": "bfbff7852f050232edd3e5ca5c6bf2021c340f5a",
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                "status": "affected",
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              },
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              },
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                "status": "affected",
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                "version": "8.11.1"
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              },
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                "version": "8.10.1"
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                "status": "affected",
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              },
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              },
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              },
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                "status": "affected",
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              },
              {
                "status": "affected",
                "version": "8.4.0"
              },
              {
                "status": "affected",
                "version": "8.3.0"
              },
              {
                "status": "affected",
                "version": "8.2.1"
              },
              {
                "status": "affected",
                "version": "8.2.0"
              },
              {
                "status": "affected",
                "version": "8.1.2"
              },
              {
                "status": "affected",
                "version": "8.1.1"
              },
              {
                "status": "affected",
                "version": "8.1.0"
              },
              {
                "status": "affected",
                "version": "8.0.1"
              },
              {
                "status": "affected",
                "version": "8.0.0"
              },
              {
                "status": "affected",
                "version": "7.88.1"
              },
              {
                "status": "affected",
                "version": "7.88.0"
              }
            ]
          }
        ],
        "source": "2499f714-1537-4658-8207-48ae4bb9eae9"
      }
    ],
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
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              }
            ],
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        ]
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    ],
    "cveTags": [],
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      }
    ],
    "id": "CVE-2026-10536",
    "lastModified": "2026-09-15T07:16:25.137",
    "metrics": {
      "cvssMetricV31": [
        {
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            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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      "ssvcV203": [
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          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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            "options": [
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              },
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              },
              {
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              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-07-06T18:28:36.822614Z",
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        }
      ]
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      },
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      },
      {
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    ],
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        "type": "Secondary"
      },
      {
        "description": [
          {
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            "value": "CWE-416"
          }
        ],
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  }
}

—

CVSS vector

cvss_vector

not compared

Red Hat

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

receipt

Source: Red Hat
Its words: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Read by: field:cvss3_scoring_vector
Said since: 2026-10-06 13:01 UTC
Last answered: 2026-10-06 13:02 UTC
Original: open at the source

2026-10-06 13:01 UTC	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
2026-09-29 09:44 UTC	—

What the source handed over

{
  "CVE": "CVE-2026-10536",
  "CWE": "CWE-825",
  "advisories": [
    "RHSA-2026:41240"
  ],
  "affected_packages": [
    "curl-main-8.21.0-0.1.1.hum1"
  ],
  "bugzilla": "2496766",
  "bugzilla_description": "libcurl: libcurl: Use-after-free vulnerability leading to Denial of Service",
  "cvss3_score": "4.7",
  "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2026-07-03T06:11:15Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-10536.json",
  "severity": "moderate"
}

—

CWE

cwe

different words

NVD

CWE-416

receipt

Source: NVD
Its words: CWE-416
Read by: field:cve.weaknesses[].description[].value
Said since: 2026-10-06 12:29 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:29 UTC	CWE-416
2026-09-29 09:45 UTC	—

What the source handed over

{
  "cve": {
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      {
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            "product": "curl",
            "vendor": "curl",
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                "status": "affected",
                "version": "8.15.0",
                "versionType": "semver"
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              {
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                "status": "affected",
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                "versionType": "semver"
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            ]
          },
          {
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            "repo": "https://github.com/curl/curl.git",
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                "versionType": "git"
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          },
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                "status": "affected",
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              },
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                "status": "affected",
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                "status": "affected",
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              },
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              },
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                "status": "affected",
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              },
              {
                "status": "affected",
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              },
              {
                "status": "affected",
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              {
                "status": "affected",
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              },
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              {
                "status": "affected",
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              {
                "status": "affected",
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                "status": "affected",
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                "status": "affected",
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              },
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                "status": "affected",
                "version": "8.1.1"
              },
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                "status": "affected",
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        ],
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            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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      ],
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        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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              {
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              },
              {
                "technicalImpact": "total"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-07-06T18:28:36.822614Z",
            "version": "2.0.3"
          }
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      },
      {
        "source": "2499f714-1537-4658-8207-48ae4bb9eae9",
        "tags": [
          "Vendor Advisory"
        ],
        "url": "https://curl.se/docs/CVE-2026-10536.json"
      },
      {
        "source": "2499f714-1537-4658-8207-48ae4bb9eae9",
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      },
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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          "Exploit",
          "Issue Tracking",
          "Third Party Advisory"
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    ],
    "sourceIdentifier": "2499f714-1537-4658-8207-48ae4bb9eae9",
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            "lang": "en",
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        "type": "Secondary"
      },
      {
        "description": [
          {
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            "value": "CWE-416"
          }
        ],
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  }
}

—

CWE

cwe

different words

Red Hat

CWE-825

receipt

Source: Red Hat
Its words: CWE-825
Read by: field:CWE
Said since: 2026-09-29 09:44 UTC
Last answered: 2026-10-06 13:02 UTC
Original: open at the source

What the source handed over

{
  "CVE": "CVE-2026-10536",
  "CWE": "CWE-825",
  "advisories": [
    "RHSA-2026:41240"
  ],
  "affected_packages": [
    "curl-main-8.21.0-0.1.1.hum1"
  ],
  "bugzilla": "2496766",
  "bugzilla_description": "libcurl: libcurl: Use-after-free vulnerability leading to Denial of Service",
  "cvss3_score": "4.7",
  "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2026-07-03T06:11:15Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-10536.json",
  "severity": "moderate"
}

—

Exploitation

exploitation

NVD

poc

A public proof of concept exists, or exploitation is trivial.

receipt

Source: NVD
Its words: poc
Read by: field:cve.metrics.ssvcV203[].ssvcData.options[].exploitation
Said since: 2026-10-06 12:29 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:29 UTC	poc
2026-09-29 09:45 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "curl",
            "vendor": "curl",
            "versions": [
              {
                "lessThan": "8.14.2",
                "status": "affected",
                "version": "7.88.0",
                "versionType": "semver"
              },
              {
                "lessThan": "8.16.1",
                "status": "affected",
                "version": "8.15.0",
                "versionType": "semver"
              },
              {
                "lessThan": "8.20.1",
                "status": "affected",
                "version": "8.17.0",
                "versionType": "semver"
              }
            ]
          },
          {
            "defaultStatus": "unaffected",
            "product": "curl",
            "repo": "https://github.com/curl/curl.git",
            "vendor": "curl",
            "versions": [
              {
                "lessThan": "bfbff7852f050232edd3e5ca5c6bf2021c340f5a",
                "status": "affected",
                "version": "71b7e0161032927cdfb4e75ea40f65b8898b3956",
                "versionType": "git"
              }
            ]
          },
          {
            "defaultStatus": "unaffected",
            "product": "curl",
            "vendor": "curl",
            "versions": [
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                "version": "8.20.0"
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              {
                "status": "affected",
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              },
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                "status": "affected",
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              },
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                "status": "affected",
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              {
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              },
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                "version": "8.11.1"
              },
              {
                "status": "affected",
                "version": "8.11.0"
              },
              {
                "status": "affected",
                "version": "8.10.1"
              },
              {
                "status": "affected",
                "version": "8.10.0"
              },
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                "status": "affected",
                "version": "8.9.1"
              },
              {
                "status": "affected",
                "version": "8.9.0"
              },
              {
                "status": "affected",
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              },
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              {
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              {
                "status": "affected",
                "version": "8.2.0"
              },
              {
                "status": "affected",
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              },
              {
                "status": "affected",
                "version": "8.1.1"
              },
              {
                "status": "affected",
                "version": "8.1.0"
              },
              {
                "status": "affected",
                "version": "8.0.1"
              },
              {
                "status": "affected",
                "version": "8.0.0"
              },
              {
                "status": "affected",
                "version": "7.88.1"
              },
              {
                "status": "affected",
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        "source": "2499f714-1537-4658-8207-48ae4bb9eae9"
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    "configurations": [
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    ],
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      }
    ]
  }
}

—

Fixed in

fixed_in

NVD

8.14.2, 8.16.1, 8.20.1

receipt

Source: NVD
Its words: 8.14.2, 8.16.1, 8.20.1
Read by: field:cve.affected[].affectedData[].versions[status=affected].lessThan
Said since: 2026-10-06 12:29 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:29 UTC	8.14.2, 8.16.1, 8.20.1
2026-09-29 09:45 UTC	—

What the source handed over

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}

—

Packages

packages

Red Hat

curl-main-8.21.0-0.1.1.hum1

receipt

Source: Red Hat
Its words: curl-main-8.21.0-0.1.1.hum1
Read by: field:affected_packages[]
Said since: 2026-09-29 09:44 UTC
Last answered: 2026-10-06 13:02 UTC
Original: open at the source

What the source handed over

{
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  "CWE": "CWE-825",
  "advisories": [
    "RHSA-2026:41240"
  ],
  "affected_packages": [
    "curl-main-8.21.0-0.1.1.hum1"
  ],
  "bugzilla": "2496766",
  "bugzilla_description": "libcurl: libcurl: Use-after-free vulnerability leading to Denial of Service",
  "cvss3_score": "4.7",
  "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2026-07-03T06:11:15Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-10536.json",
  "severity": "moderate"
}

—

Product

product

NVD

curl

receipt

Source: NVD
Its words: curl
Read by: field:cve.affected[].affectedData[].product
Said since: 2026-09-29 17:49 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-09-29 17:49 UTC	curl
2026-09-29 09:45 UTC	—

What the source handed over

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      {
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        "source": "nvd@nist.gov",
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      }
    ]
  }
}

—

Severity

severity

conflict

NVD

CRITICAL

From the CVSS base score at 9.0 and above.

receipt

Source: NVD
Its words: CRITICAL
Read by: field:cve.metrics.cvssMetricV31[type=Primary].cvssData.baseSeverity || field:cve.metrics.cvssMetricV31[].cvssData.baseSeverity
Said since: 2026-10-06 12:29 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:29 UTC	CRITICAL
2026-09-29 09:45 UTC	—

What the source handed over

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      }
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}

critical

Severity

severity

conflict

Red Hat

moderate

A flaw that is harder to exploit, or whose impact is limited.

receipt

Source: Red Hat
Its words: moderate
Read by: field:severity
Said since: 2026-09-29 09:44 UTC
Last answered: 2026-10-06 13:02 UTC
Original: open at the source

What the source handed over

{
  "CVE": "CVE-2026-10536",
  "CWE": "CWE-825",
  "advisories": [
    "RHSA-2026:41240"
  ],
  "affected_packages": [
    "curl-main-8.21.0-0.1.1.hum1"
  ],
  "bugzilla": "2496766",
  "bugzilla_description": "libcurl: libcurl: Use-after-free vulnerability leading to Denial of Service",
  "cvss3_score": "4.7",
  "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2026-07-03T06:11:15Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-10536.json",
  "severity": "moderate"
}

medium

Status

status

NVD

Modified

receipt

Source: NVD
Its words: Modified
Read by: field:cve.vulnStatus
Said since: 2026-09-29 09:45 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

What the source handed over

{
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              },
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          },
          {
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            "repo": "https://github.com/curl/curl.git",
            "vendor": "curl",
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              },
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                "status": "affected",
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              },
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              },
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                "status": "affected",
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              },
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              },
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              },
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      }
    ],
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    "lastModified": "2026-09-15T07:16:25.137",
    "metrics": {
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            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
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          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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        }
      ],
      "ssvcV203": [
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          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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            "options": [
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              },
              {
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              }
            ],
            "role": "CISA Coordinator",
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            "version": "2.0.3"
          }
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    "references": [
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      },
      {
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        "tags": [
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        ],
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      },
      {
        "source": "2499f714-1537-4658-8207-48ae4bb9eae9",
        "tags": [
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          "Issue Tracking",
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        ],
        "url": "https://hackerone.com/reports/3751697"
      },
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "tags": [
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        "url": "https://hackerone.com/reports/3751697"
      }
    ],
    "sourceIdentifier": "2499f714-1537-4658-8207-48ae4bb9eae9",
    "vulnStatus": "Modified",
    "weaknesses": [
      {
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          {
            "lang": "en",
            "value": "CWE-416"
          }
        ],
        "source": "2499f714-1537-4658-8207-48ae4bb9eae9",
        "type": "Secondary"
      },
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-416"
          }
        ],
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  }
}

—

Technical impact

technical_impact

NVD

total

The attacker gains full control of the component, or all of its information.

receipt

Source: NVD
Its words: total
Read by: field:cve.metrics.ssvcV203[].ssvcData.options[].technicalImpact
Said since: 2026-10-06 12:29 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:29 UTC	total
2026-09-29 09:45 UTC	—

What the source handed over

{
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    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "curl",
            "vendor": "curl",
            "versions": [
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                "lessThan": "8.14.2",
                "status": "affected",
                "version": "7.88.0",
                "versionType": "semver"
              },
              {
                "lessThan": "8.16.1",
                "status": "affected",
                "version": "8.15.0",
                "versionType": "semver"
              },
              {
                "lessThan": "8.20.1",
                "status": "affected",
                "version": "8.17.0",
                "versionType": "semver"
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          },
          {
            "defaultStatus": "unaffected",
            "product": "curl",
            "repo": "https://github.com/curl/curl.git",
            "vendor": "curl",
            "versions": [
              {
                "lessThan": "bfbff7852f050232edd3e5ca5c6bf2021c340f5a",
                "status": "affected",
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                "versionType": "git"
              }
            ]
          },
          {
            "defaultStatus": "unaffected",
            "product": "curl",
            "vendor": "curl",
            "versions": [
              {
                "status": "affected",
                "version": "8.20.0"
              },
              {
                "status": "affected",
                "version": "8.19.0"
              },
              {
                "status": "affected",
                "version": "8.18.0"
              },
              {
                "status": "affected",
                "version": "8.17.0"
              },
              {
                "status": "affected",
                "version": "8.16.0"
              },
              {
                "status": "affected",
                "version": "8.15.0"
              },
              {
                "status": "affected",
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              },
              {
                "status": "affected",
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              },
              {
                "status": "affected",
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              },
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              },
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              },
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              },
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                "status": "affected",
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              },
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              },
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              },
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                "status": "affected",
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                "version": "8.0.1"
              },
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              },
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                "status": "affected",
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              },
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      }
    ]
  }
}

—

Vendor

vendor

NVD

curl

receipt

Source: NVD
Its words: curl
Read by: field:cve.affected[].affectedData[].vendor
Said since: 2026-09-29 17:49 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-09-29 17:49 UTC	curl
2026-09-29 09:45 UTC	—

What the source handed over

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  }
}

—

Every claim, by kind

vulnerability

libcurl: libcurl: Use-after-free vulnerability leading to Denial of Service zetlyn/cve-redhat · 2026-07-03	cvss 4.7 cvss_vector CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H cwe CWE-825 packages curl-main-8.21.0-0.1.1.hum1 severity moderate	source
A use-after-free vulnerability exists in libcurl when an application configures an HTTP/2 stream-dependency tree via `CURLOPT_STREAM_DEPENDS` or `CURLOPT_STREAM_DEPENDS_E`, subsequently invokes `curl_easy_reset()`, and finally terminates the handle with `curl_easy_cleanup()`. During this final cleanup phase, libcurl attempts to access and modify an internal structure that was already freed during the reset operation. zetlyn/cve-nvd · 2026-07-03	automatable yes cvss 9.8 cvss_vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H cwe CWE-416 exploitation poc fixed_in 8.14.2, 8.16.1, 8.20.1 product curl severity CRITICAL status Modified technical_impact total vendor curl	source