CVE-2026-41488 — Server-Side Request Forgery in Langchain-openai

CWE-918 — Server-Side Request ForgeryCWE-367 — Time-of-check Time-of-use (TOCTOU) Race Condition4 documents4 sources
Severity
3.1LOWNVD
EPSS
0.0%
top 90.99%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
11
Langchain-ai Langchain-openaiAnsible-automation-platform-24 Lightspeed-rhel8Ansible-automation-platform-25 Lightspeed-chatbot-rhel8+8 more
Timeline
PublishedApr 24
Latest updateApr 25

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.

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:NExploitability: 1.6 | Impact: 1.4

Affected Packages11 packages

▶CVEListV5langchain-ai/langchain-openai< 1.1.14

🔴Vulnerability Details

1
VulDB
langchain-ai langchain-openai up to 1.1.13 DNS Resolution _url_to_size server-side request forgery (GHSA-r7w7-9xr2-qq2r / EUVD-2026-25635)↗2026-04-25
▶

📋Vendor Advisories

1
Red Hat
langchain-openai: Langchain-openai: Server-Side Request Forgery (SSRF) protection bypass via DNS rebinding↗2026-04-24
▶

💬Community

1
Bugzilla
CVE-2026-41488 langchain-openai: Langchain-openai: Server-Side Request Forgery (SSRF) protection bypass via DNS rebinding↗2026-04-24
▶
CVE-2026-41488 — Server-Side Request Forgery | cvebase