{"id":"CVE-2025-68664","aliases":["GHSA-c67j-w6g6-q2cm","PYSEC-2026-373"],"url":"https://o3.security/vulnerability/CVE-2025-68664","summary":"LangChain serialization injection vulnerability enables secret extraction in dumps/loads APIs","details":"LangChain is a framework for building agents and LLM-powered applications. Prior to versions 0.3.81 and 1.2.5, a serialization injection vulnerability exists in LangChain's dumps() and dumpd() functions. The functions do not escape dictionaries with 'lc' keys when serializing free-form dictionaries. The 'lc' key is used internally by LangChain to mark serialized objects. When user-controlled data contains this key structure, it is treated as a legitimate LangChain object during deserialization rather than plain user data. This issue has been patched in versions 0.3.81 and 1.2.5.","published":"2025-12-23T22:47:44.084Z","modified":"2026-08-12T03:51:47.282740268Z","cvss":{"score":9.3,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N"},"epss":{"score":0.43415,"percentile":0.98634,"asOf":"2026-08-24"},"cisaKev":null,"exploitsKnown":2,"affectedPackages":[{"ecosystem":"PyPI","name":"langchain-core","fixedVersion":"1.2.5"},{"ecosystem":"PyPI","name":"langchain-core","fixedVersion":"0.3.81"}],"fix":{"url":"https://github.com/langchain-ai/langchain/commit/5ec0fa69de31bbe3d76e4cf9cd65a6accb8466c8","label":"langchain-ai/langchain@5ec0fa6"},"references":[{"type":"WEB","url":"https://github.com/langchain-ai/langchain/releases/tag/langchain-core%3D%3D0.3.81"},{"type":"WEB","url":"https://github.com/langchain-ai/langchain/releases/tag/langchain-core%3D%3D1.2.5"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/68xxx/CVE-2025-68664.json"},{"type":"ADVISORY","url":"https://github.com/langchain-ai/langchain/security/advisories/GHSA-c67j-w6g6-q2cm"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-68664"},{"type":"FIX","url":"https://github.com/langchain-ai/langchain/commit/5ec0fa69de31bbe3d76e4cf9cd65a6accb8466c8"},{"type":"FIX","url":"https://github.com/langchain-ai/langchain/commit/d9ec4c5cc78960abd37da79b0250f5642e6f0ce6"},{"type":"FIX","url":"https://github.com/langchain-ai/langchain/pull/34455"},{"type":"FIX","url":"https://github.com/langchain-ai/langchain/pull/34458"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:47.282740268Z"}}