CVE-2026-119332 (GCVE-0-2026-119332)

Vulnerability from cvelistv5 – Published: 2026-10-30 19:57 – Updated: 2026-10-30 19:57
VLAI
Title
Ladybird: FinalizationRegistry::cleanup() heap use-after-free via reentrant unregister()
Summary
Ladybird is a truly independent web browser. Prior to 209579c96473c75bd5eba9701fcadb841a045964, FinalizationRegistry::cleanup() in Libraries/LibJS/Runtime/FinalizationRegistry.cpp removed a dead record from m_records, retained an iterator to the next FinalizationRecord, and then invoked attacker-controlled JavaScript through the cleanup callback. If that callback called unregister() for the next record, remove_by_token() freed the node referenced by the retained iterator, and the next cleanup iteration read its target and held_value fields after free. This reliably crashes instrumented WebContent builds and creates a memory-corruption primitive in production builds. This vulnerability is fixed by commit 209579c96473c75bd5eba9701fcadb841a045964.
Severity
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7886 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
LadybirdBrowser ladybird Affected: < 209579c96473c75bd5eba9701fcadb841a045964
guessed Create a notification for this product.
Show details on NVD website
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "ladybird",
          "vendor": "LadybirdBrowser",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 209579c96473c75bd5eba9701fcadb841a045964"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Ladybird is a truly independent web browser. Prior to 209579c96473c75bd5eba9701fcadb841a045964, FinalizationRegistry::cleanup() in Libraries/LibJS/Runtime/FinalizationRegistry.cpp removed a dead record from m_records, retained an iterator to the next FinalizationRecord, and then invoked attacker-controlled JavaScript through the cleanup callback. If that callback called unregister() for the next record, remove_by_token() freed the node referenced by the retained iterator, and the next cleanup iteration read its target and held_value fields after free. This reliably crashes instrumented WebContent builds and creates a memory-corruption primitive in production builds. This vulnerability is fixed by commit 209579c96473c75bd5eba9701fcadb841a045964."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-416",
              "description": "CWE-416: Use After Free",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T19:57:47.291Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/LadybirdBrowser/ladybird/security/advisories/GHSA-6cmv-xmff-qjph",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/LadybirdBrowser/ladybird/security/advisories/GHSA-6cmv-xmff-qjph"
        },
        {
          "name": "https://github.com/LadybirdBrowser/ladybird/commit/209579c96473c75bd5eba9701fcadb841a045964",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/LadybirdBrowser/ladybird/commit/209579c96473c75bd5eba9701fcadb841a045964"
        }
      ],
      "source": {
        "advisory": "GHSA-6cmv-xmff-qjph",
        "discovery": "UNKNOWN"
      },
      "title": "Ladybird: FinalizationRegistry::cleanup() heap use-after-free via reentrant unregister()"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-119332",
    "datePublished": "2026-10-30T19:57:47.291Z",
    "dateReserved": "2026-10-29T20:44:30.285Z",
    "dateUpdated": "2026-10-30T19:57:47.291Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-119332",
      "date": "2026-11-04",
      "epss": "0.00242",
      "percentile": "0.15437"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "product": "ladybird",
                "vendor": "LadybirdBrowser",
                "versions": [
                  {
                    "status": "affected",
                    "version": "\u003c 209579c96473c75bd5eba9701fcadb841a045964"
                  }
                ]
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            ],
            "source": "security-advisories@github.com"
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        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "Ladybird is a truly independent web browser. Prior to 209579c96473c75bd5eba9701fcadb841a045964, FinalizationRegistry::cleanup() in Libraries/LibJS/Runtime/FinalizationRegistry.cpp removed a dead record from m_records, retained an iterator to the next FinalizationRecord, and then invoked attacker-controlled JavaScript through the cleanup callback. If that callback called unregister() for the next record, remove_by_token() freed the node referenced by the retained iterator, and the next cleanup iteration read its target and held_value fields after free. This reliably crashes instrumented WebContent builds and creates a memory-corruption primitive in production builds. This vulnerability is fixed by commit 209579c96473c75bd5eba9701fcadb841a045964."
          }
        ],
        "id": "CVE-2026-119332",
        "lastModified": "2026-11-02T19:35:33.347",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
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                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
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                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
                "version": "3.1"
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            }
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        "published": "2026-10-30T20:17:07.600",
        "references": [
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            "source": "security-advisories@github.com",
            "url": "https://github.com/LadybirdBrowser/ladybird/commit/209579c96473c75bd5eba9701fcadb841a045964"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/LadybirdBrowser/ladybird/security/advisories/GHSA-6cmv-xmff-qjph"
          }
        ],
        "sourceIdentifier": "security-advisories@github.com",
        "vulnStatus": "Deferred",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-416"
              }
            ],
            "source": "security-advisories@github.com",
            "type": "Primary"
          }
        ]
      }
    }
  }
}



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