CVE-2026-26013
LangChain affected by SSRF via image_url token counting in ChatOpenAI.get_num_tokens_from_messages
- State
- Published
- Severity
- 3.7 Low
- Published
- Feb 10, 2026
- Updated
- Feb 11, 2026
- Reserved
- Feb 9, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 3.7 Low | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L | GitHub_M |
Weaknesses
- CWE-918 Server-Side Request Forgery (SSRF)
Affected Products
| Product | Versions |
|---|---|
langchainlangchain-ai |
|
References
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