What’s Vulnerable › Vulnerabilities

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

• Severity: low (CVSS 3.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-02-10 · updated 2026-06-17
• Weakness: CWE-918

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 products

• langchain-ai langchain: before 1.2.11 — fixed in 1.2.11

How to fix

Upgrade to a fixed version: langchain-ai langchain 1.2.11. Check the vendor advisory for mitigations.

References

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

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