CVE-2026-26013 | THREATINT

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.

PUBLISHED Reserved 2026-02-09 | Published 2026-02-10 | Updated 2026-02-11 | Assigner GitHub_M

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

Problem types

CWE-918: Server-Side Request Forgery (SSRF)

Product status

< 1.2.11

affected

References

github.com/...gchain/security/advisories/GHSA-2g6r-c272-w58r

github.com/...ommit/2b4b1dc29a833d4053deba4c2b77a3848c834565

github.com/.../langchain/releases/tag/langchain-core==1.2.11

cve.org (CVE-2026-26013)

nvd.nist.gov (CVE-2026-26013)

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