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.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2026-41488)

ID	Name	Product	Family	Type	Severity
457407	Echo: langchain-openai: security update to 1.1.14	Tenable Cloud Security	Echo Local Security Checks	Local	low
457407	Echo: langchain-openai: security update to 1.1.14	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	low
440915	SCA: security update for langchain-openai (GHSA-r7w7-9xr2-qq2r)	Tenable Cloud Security	SCA Checks	Local	low
440915	SCA: security update for langchain-openai (GHSA-r7w7-9xr2-qq2r)	Tenable Self-Hosted Container Security	SCA Checks	Local	low

Detections

Analytics

CVE-2026-41488

low

Tenable Plugins

low

low

low

low