SSRF in Langchain Core
CVE-2026-26013
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.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.004 (34.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 34.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000
Affected products
- Langchain Core
- Langchain-Ai Langchain — versions < 1.2.11
Weakness classification (CWE)
References
- github.com/langchain-ai/langchain/security/advisories/GHSA-2g6r-c272-w58r (Mitigation, Vendor Advisory)
- github.com/langchain-ai/langchain/commit/2b4b1dc29a833d4053deba4c2b77a3848c8345… (Patch)
- github.com/langchain-ai/langchain/releases/tag/langchain-core==1.2.11 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-26013?
- CVE-2026-26013 is a low-severity vulnerability in Langchain Core, classified under Server-Side Request Forgery (SSRF). CVSS score: 3.7/10. Published 2026-02-10.
- How severe is CVE-2026-26013?
- Low severity. CVSS v3 base score is 3.7 out of 10.