VULNERABILITY INTELLIGENCE
CVE-2025-68664
CVSS score9.3 CRITICAL
EPSS probability42.93%
CISA KEVNot currently listed
Published2025-12-23
Last modified2026-10-19
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N
Description
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.
Weakness classification
- security-advisories@github.com: CWE-502
Primary references
- security-advisories@github.com — Patch
- security-advisories@github.com — Patch
- security-advisories@github.com — Issue Tracking, Patch
- security-advisories@github.com — Issue Tracking, Patch
- security-advisories@github.com — Release Notes
- security-advisories@github.com — Release Notes
- security-advisories@github.com — Exploit, Vendor Advisory
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 — Exploit, Vendor Advisory