{"id":"CVE-2026-119332","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 iterato…","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cvssSource":"cna","cwe":["CWE-416"],"vendor":"LadybirdBrowser","product":"ladybird","affected":["ladybird < 209579c96473c75bd5eba9701fcadb841a045964"],"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"total","timestamp":"2026-11-06T17:59:51.184931Z"},"exploitAvailable":true,"published":"2026-10-30","updated":"2026-11-06","sourceUpdated":"2026-11-06T18:00:51.305Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-119332","references":[{"url":"https://github.com/LadybirdBrowser/ladybird/security/advisories/GHSA-6cmv-xmff-qjph","label":"https://github.com/LadybirdBrowser/ladybird/security/advisories/GHSA-6cmv-xmff-qjph"},{"url":"https://github.com/LadybirdBrowser/ladybird/commit/209579c96473c75bd5eba9701fcadb841a045964","label":"https://github.com/LadybirdBrowser/ladybird/commit/209579c96473c75bd5eba9701fcadb841a045964"}],"tags":["cve.org","exploit-available"],"epss":0.00242,"epssPercentile":0.15392,"ingestedAt":"2026-11-05T16:24:31.432Z","slug":"CVE-2026-119332","body":"## Overview\n\nLadybird 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.\n\n## Affected\n\n- `ladybird < 209579c96473c75bd5eba9701fcadb841a045964`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":60,"depthScoreParts":{"impact":48.4,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[{"seq":235585,"id":"CVE-2026-119332","ts":1793991740034,"field":"exploit_available","old":"false","new":"true"}]}