CVE-2026-41488

low

Published 2026-04-24 · Modified 2026-05-20

CVSS v3

3.1

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

CVSS v2

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VIR risk

3.1

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.

Predictions

Exploit likelihood

42%

Patch ETA

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

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

Package impact

Ecosystem	Package	Vulnerable	Fixed
PyPI	langchain-openai	`<1.1.14`	`1.1.14`

Application impact

Vendor	Product	Versions	Fixed
langchain	langchain-openai	`{"endExcluding":"1.1.14"}`	`1.1.14`

References

CWEs

CWE-918

Verify integrity in audit chain (admin only). AS-IS.