CVE-2026-41488
Last modified
CVE-2026-41488 is a low-severity vulnerability rated 3.1/10 on the CVSS scale. 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. EPSS estimates a 0.16% chance of exploitation in the next 30 days.
Description
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.
Metrics
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Langchain | Langchain-Openai | < 1.1.14 |
References
- https://github.com/langchain-ai/langchain/security/advisories/GHSA-r7w7-9xr2-qq2rMitigation, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
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