| Component | LangChain |
| Severity | low (CVSS 3.7) |
| CVSS vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L |
| Published (NVD) | 2026-02-10 |
| Last modified | 2026-06-17 |
| Affected versions | langchain_core < 1.2.11 |
| Fixed in | 1.2.11 |
| Weakness | CWE-918 |
| CISA KEV | not listed |
NVD 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
- Upgrade LangChain to
1.2.11or later. - Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
- NVD: CVE-2026-26013
- 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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