PT-2026-35087 · Pypi · Langchain-Openai

Deprrous · Published 2026-04-16 · Updated 2026-04-25 · CVE-2026-41488

Positive Technologies (AI Summary)

CVSS v3.1

3.1

Low

Base vector

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

Name of the Vulnerable Software and Affected Versions langchain-openai versions prior to 1.1.14

Description The url to size() helper function, utilized by get num tokens from messages for image token counting, contains a Time-of-Check to Time-of-Use (TOCTOU) flaw. The function validates URLs for Server-Side Request Forgery (SSRF) protection and subsequently fetches them using a separate network operation with independent DNS resolution. This creates a DNS rebinding window where an attacker-controlled hostname can resolve to a public IP during the validation phase and then resolve to a private or localhost IP during the actual fetch operation.

Recommendations Update to version 1.1.14 or later.

Fix

SSRF

Weakness Enumeration

CWE-918

Related Identifiers

CVE-2026-41488

GHSA-R7W7-9XR2-QQ2R

PYSEC-2026-76

Affected Products

Langchain-Openai

References · 9

• https://github.com/langchain-ai/langchain/security/advisories/GHSA-r7w7-9xr2-qq2r · Vendor Advisory
• https://osv.dev/vulnerability/PYSEC-2026-76 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-41488 · Security Note
• https://osv.dev/vulnerability/GHSA-r7w7-9xr2-qq2r · Vendor Advisory
• https://github.com/langchain-ai/langchain · Note
• https://github.com/pypa/advisory-database/tree/main/vulns/langchain-openai/PYSEC-2026-76.yaml · Note
• https://twitter.com/Sattyamjjain/status/2048052345163174184 · Twitter Post
• https://twitter.com/CVEnew/status/2047798549287682285 · Twitter Post
• https://twitter.com/Sattyamjjain/status/2048052075767255247 · Twitter Post