Vulnerability · Published Feb 10, 2026 · Assigned by GitHub_M

CVE-2026-26013LangChain affected by SSRF via image_url token counting in ChatOpenAI.get_num_tokens_from_messages

Low 3.7

In plain English

A low-severity server-side request forgery in langchain from langchain-ai. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)3.7Low

Exploit odds (30 days)0.4%top 63.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	langchain-core	1.2.11	GHSA-2g6r-c272-w58r
PyPI	langchain-core	1.2.11	PYSEC-2026-2562

Affected products (as reported)

Vendor	Product	Versions
langchain-ai	langchain	< 1.2.11

Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

References

https://github.com/langchain-ai/langchain/security/advisories/GHSA-2g6r-c272-w58r x_refsource_CONFIRM
https://github.com/langchain-ai/langchain/commit/2b4b1dc29a833d4053deba4c2b77a3848c834565 x_refsource_MISC
https://github.com/langchain-ai/langchain/releases/tag/langchain-core%3D%3D1.2.11 x_refsource_MISC