SSRF in Langchain Langchain-Openai
CVE-2026-41488
LangChain is a framework for building agents and LLM-powered applications. Prior to 1.1.14, langchain-openai's _url_to_size() helper (used by get_num_tokens_from_messages for image token counting) validated URLs for SSRF protection and then fetched them in a separate network operation with independent DNS resolution. This left a TOCTOU / DNS rebinding window: an attacker-controlled hostname could resolve to a public IP during validation and then to a private/localhost IP during the actual fetch.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.1 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.002 (13.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 13th percentile — 13.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.001
Affected products
- Langchain Langchain-Openai
- Langchain-Ai Langchain-Openai — versions < 1.1.14
Weakness classification (CWE)
References
- github.com/langchain-ai/langchain/security/advisories/GHSA-r7w7-9xr2-qq2r (Mitigation, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-41488?
- CVE-2026-41488 is a low-severity vulnerability in Langchain Langchain-Openai, classified under Server-Side Request Forgery (SSRF). CVSS score: 3.1/10. Published 2026-04-24.
- How severe is CVE-2026-41488?
- Low severity. CVSS v3 base score is 3.1 out of 10.