# CVE-2025-68664: LangChain serialization injection vulnerability enables secret extraction in dumps/loads APIs

> CVE-2025-68664: LangChain serialization injection vulnerability enables secret extraction in dumps/loads APIs. CVSS 9.3 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2025-68664
Last updated: 2026-10-19T22:10:00Z

- Published: 2025-12-23 22:47 UTC · Updated: 2026-10-19 22:10 UTC · Assigner: GitHub\_M
- CVSS: 9.3 (CVSS 3.1) · Severity: Critical · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N
- EPSS: 42.9%, 99th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-502

## 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.

## Affected vendors and products

- langchain-ai: langchain

## Tracked companies

- [LangChain (LangSmith)](https://rewindex.com/company/langchain-langsmith.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2025-68664)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2025-68664)
- [https://github.com/langchain-ai/langchain/commit/5ec0fa69de31bbe3d76e4cf9cd65a6accb8466c8](https://github.com/langchain-ai/langchain/commit/5ec0fa69de31bbe3d76e4cf9cd65a6accb8466c8)
- [https://github.com/langchain-ai/langchain/commit/d9ec4c5cc78960abd37da79b0250f5642e6f0ce6](https://github.com/langchain-ai/langchain/commit/d9ec4c5cc78960abd37da79b0250f5642e6f0ce6)
- [https://github.com/langchain-ai/langchain/pull/34455](https://github.com/langchain-ai/langchain/pull/34455)
- [https://github.com/langchain-ai/langchain/pull/34458](https://github.com/langchain-ai/langchain/pull/34458)
- [https://github.com/langchain-ai/langchain/releases/tag/langchain-core%3D%3D0.3.81](https://github.com/langchain-ai/langchain/releases/tag/langchain-core%253D%253D0.3.81)
- [https://github.com/langchain-ai/langchain/releases/tag/langchain-core%3D%3D1.2.5](https://github.com/langchain-ai/langchain/releases/tag/langchain-core%253D%253D1.2.5)
- [https://github.com/langchain-ai/langchain/security/advisories/GHSA-c67j-w6g6-q2cm](https://github.com/langchain-ai/langchain/security/advisories/GHSA-c67j-w6g6-q2cm)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2025-68664 · Markdown: https://rewindex.com/cve/CVE-2025-68664.md · JSON: https://rewindex.com/api/v1/cves/CVE-2025-68664 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:13:04.528Z