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Saint LangGrinch
Hagiography in preparation at the scriptorium.
Feast day December 26
Technical record
- Disclosed on
- December 26 2025
- CVE
- CVE-2025-68664
- CVSS
- 9.3
- Product
- langchain-ai · langchain
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.
Sources: cyata.ai