What’s Vulnerable › Vulnerabilities
CVE-2026-41488: angchain-openai: Image token counting SSRF protection can be bypassed via DNS rebinding
- Severity: low (CVSS 3.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-04-24 · updated 2026-10-26
- Weakness: CWE-918
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.
Affected products
- langchain-ai langchain-openai: before 1.1.14 — fixed in 1.1.14
How to fix
Upgrade to a fixed version: langchain-ai langchain-openai 1.1.14. Check the vendor advisory for mitigations.
References
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