CVE-2026-26013: LangChain affected by SSRF via image_url token counting in ChatOpenAI.get_num_tokens_from_messages
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.
References
- github.com/advisories/GHSA-2g6r-c272-w58r
- github.com/langchain-ai/langchain
- github.com/langchain-ai/langchain/commit/2b4b1dc29a833d4053deba4c2b77a3848c834565
- github.com/langchain-ai/langchain/releases/tag/langchain-core%3D%3D1.2.11
- github.com/langchain-ai/langchain/security/advisories/GHSA-2g6r-c272-w58r
- nvd.nist.gov/vuln/detail/CVE-2026-26013
Code Behaviors & Features
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