RewindexCVEsLangChain (LangSmith)
CVE-2026-26013: LangChain affected by SSRF via image_url token counting in ChatOpenAI.get_num_tokens_from_messages
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.
Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L · CWE-918
Tracked companies
Mapped from the CVE’s affected-product data, NVD CPE matches, vendor advisories or package feeds. A mapping means the vendor’s software is named, not that its hosted service was exposed.
Status incidents that name it
No tracked status incident names this CVE.
Affected vendors and products
langchain-ai: langchain
References
- CVE record on cve.org (opens in new tab)
- NVD entry (opens in new tab)
- github.com/langchain-ai/langchain/commit/2b4b1dc29a833d4053deba4c2b77a3848c83456… (opens in new tab)
- github.com/langchain-ai/langchain/releases/tag/langchain-core%3D%3D1.2.11 (opens in new tab)
- github.com/langchain-ai/langchain/security/advisories/GHSA-2g6r-c272-w58r (opens in new tab)
- CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (opens in new tab)
- This product uses data from the NVD API but is not endorsed or certified by the NVD. (opens in new tab)
- Known Exploited Vulnerabilities catalog from CISA. (opens in new tab)
- EPSS scores from FIRST (Exploit Prediction Scoring System). (opens in new tab)