Deserialization in Langchain Langchain_core
CVE-2025-68664
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 diction…
Vulnerability class: Insecure Deserialization
EPSS: 0.138 (96.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.3 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N.
Affected products
- Langchain Langchain_core
- Langchain-ai Langchain — versions >= 1.0.0, < 1.2.5, < 0.3.81
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC, Issue Tracking)
- security-advisories@github.com (Patch, x_refsource_MISC, Issue Tracking)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC, Release Notes)
- security-advisories@github.com (x_refsource_MISC, Release Notes)
Frequently asked questions
- What is CVE-2025-68664?
- CVE-2025-68664 is a critical-severity vulnerability in Langchain Langchain_core, classified under Deserialization of Untrusted Data. CVSS score: 9.3/10. Published 2025-12-23.
- How severe is CVE-2025-68664?
- Critical severity. CVSS v3 base score is 9.3 out of 10.
- Is CVE-2025-68664 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.