CVE-2025-68664

Severity CVSS v4.0:

Pending analysis

Type:

CWE-502 Deserialization of Untrusted Dat

Publication date:

23/12/2025

Last modified:

13/01/2026

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&#39;s dumps() and dumpd() functions. The functions do not escape dictionaries with &#39;lc&#39; keys when serializing free-form dictionaries. The &#39;lc&#39; 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.

Impact

Vector 3.x

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N CVSS v3.1 Severity and Metrics:

Base Score: 9.30 CRITICAL
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Changed
Confidentiality (C): High
Integrity (I): Low
Availability (A): None

Base Score 3.x

9.30

Severity 3.x

CRITICAL

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:a:langchain:langchain_core::::::python::*		0.3.81 (excluding)
cpe:2.3:a:langchain:langchain_core::::::python::*	1.0.0 (including)	1.2.5 (excluding)

To consult the complete list of CPE names with products and versions, see this page

CVE-2025-68664

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools