CVE-2026-41488 | BDVDB-2026-328982 Detail

langchain-ailangchain-openai

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.

Impact#

Per CVSS v3.1: confidentiality impact low, integrity impact none, availability impact none. Attack vector: network.

Weaknesses#

CWE-918 Server-Side Request Forgery (SSRF)

References#

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

Exploit#

No public exploit known

History#

Version 12026-04-24Record published in the CVE List.
Version 22026-04-27Most recent update recorded in the CVE List.

Published

Published: 2026-04-24
Last modified: 2026-04-27

Vendor information

Vendor: langchain-ai
Product: langchain-openai

All langchain-ai vulnerabilities

Score

3.1 Low

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 5.0.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Server-Side Request Forgery

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
< 1.1.14
Fixed
Not stated

Scoring System

CVSS v4.0

Not available

CVSS v3.1

3.1 Low

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

Metric breakdown
Attack Vector	Network
Attack Complexity	High
Privileges Required	None
User Interaction	Required
Scope	Unchanged
Confidentiality	Low
Integrity	None
Availability	None

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).