CVE-2026-26013

LowCVSS 3.7/10Last modified Jun 17, 2026

Description

LangChain is a framework for building agents and LLM-powered applications. Prior to 1.2.11, the ChatOpenAI.get_num_tokens_from_messages() method fetches arbitrary image_url values without validation when computing token counts for vision-enabled models. This allows attackers to trigger Server-Side Request Forgery (SSRF) attacks by providing malicious image URLs in user input. This vulnerability is fixed in 1.2.11.

Metrics

CVSS 3.1 3.7/10CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

Weakness enumeration

CWE-918

Affected software

Vendor	Product	Versions
langchain-ai	langchain	< 1.2.11

References

https://github.com/langchain-ai/langchain/commit/2b4b1dc29a833d4053deba4c2b77a3848c834565Patch
https://github.com/langchain-ai/langchain/releases/tag/langchain-core%3D%3D1.2.11Product, Release Notes
https://github.com/langchain-ai/langchain/security/advisories/GHSA-2g6r-c272-w58rMitigation, Vendor Advisory

Timeline

Published: Feb 10, 2026
Last modified: Jun 17, 2026
NVD status: Analyzed

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