CVE-2026-41488

LOW

angchain-openai: Image token counting SSRF protection can be bypassed via DNS rebinding

Title source: cna

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.

References (1)

Core 1

Core References

X_Refsource_Confirm x_refsource_confirm

https://github.com/langchain-ai/langchain/security/advisories/GHSA-r7w7-9xr2-qq2r

Scores

CVSS v3 3.1

EPSS 0.0016

EPSS Percentile 5.3%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-918

Status published

Products (3)

langchain/langchain-openai < 1.1.14

langchain-ai/langchain-openai < 1.1.14

pypi/langchain-openai 0 - 1.1.14PyPI

Published Apr 24, 2026

Tracked Since Apr 24, 2026