CVE-2026-41488
Description
A flaw was found in langchain-openai. A remote attacker could exploit a Time-of-Check to Time-of-Use (TOCTOU) vulnerability, also known as a DNS rebinding vulnerability. This occurs because the _url_to_size() helper, used for image token counting, validates URLs for Server-Side Request Forgery (SSRF) protection and then fetches them in a separate network operation with independent DNS resolution. This allows an attacker to bypass SSRF protection, potentially leading to unauthorized access to internal resources or information disclosure.
Statement
This vulnerability has a Low impact on Red Hat products. The flaw in langchain-openai allows a remote attacker to bypass Server-Side Request Forgery (SSRF) protection through a DNS rebinding attack. This is due to a Time-of-Check to Time-of-Use (TOCTOU) vulnerability during URL validation and fetching, which could lead to unauthorized access to internal resources or information disclosure. Exploitation requires a specific timing window and control over DNS resolution.
Mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 3.4 | N/A | N/A |
| Attack Vector | Network | N/A | N/A |
| Attack Complexity | High | N/A | N/A |
| Privileges Required | None | N/A | N/A |
| User Interaction | Required | N/A | N/A |
| Scope | Changed | N/A | N/A |
| Confidentiality | Low | N/A | N/A |
| Integrity Impact | None | N/A | N/A |
| Availability Impact | None | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N
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