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CVE-2026-119332— Ladybird: FinalizationRegistry::cleanup() heap use-after-free via reentrant unregister()

Quick assessment

Affected
LadybirdBrowser ladybird
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Ladybird 是一款完全独立的网络浏览器。在提交 209579c96473c75bd5eba9701fcadb841a045964 之前， 中的 函数会从 中移除一条已失效的记录，同时保留指向下一条 的迭代器，随后通过清理回调函数（cleanup callback）执行由攻击者控制的 JavaScript 代码。如果该回调函数对下一条记录调用了 ，那么 将释放该迭代器所引用的节点，导致在后续清理迭代中，程序在节点已被释放后仍读取其 和 字段。此漏洞在带有检测功能的 WebContent 构建版本中会可靠地引发崩

CVSS 8.8 · High
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I. Basic Information for CVE-2026-119332

Vulnerability Information
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Vulnerability Title
Ladybird: FinalizationRegistry::cleanup() heap use-after-free via reentrant unregister()
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
LadybirdBrowser ladybird < 209579c96473c75bd5eba9701fcadb841a045964 -

II. Public POCs for CVE-2026-119332

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III. Intelligence Information for CVE-2026-119332

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Other References for CVE-2026-119332 (2)

IV. Related Vulnerabilities

Same product: ladybird
Same vendor: LadybirdBrowser
Same weakness: CWE-416