SB2026040406 - Server-side request forgery in vLLM

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Main Vulnerability Database SB2026040406

SB2026040406 - Server-side request forgery in vLLM

Published: April 4, 2026

Security Bulletin ID SB2026040406
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Information disclosure

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Server-Side Request Forgery (SSRF) (CVE-ID: CVE-2026-25960)

CWE-ID: CWE-918 - Server-Side Request Forgery (SSRF)

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a remote user to perform server-side request forgery.

The vulnerability exists due to inconsistent URL parsing behavior in the load_from_url_async function in vllm/connections.py when validating and requesting user-supplied URLs. A remote user can supply a specially crafted URL to perform server-side request forgery.

The issue arises because the validation layer uses urllib3.util.parse_url() while the actual HTTP client uses aiohttp with yarl, allowing a backslash and @ character sequence to bypass the hostname allowlist check and access arbitrary internal or external services.


Remediation

Install update from vendor's website.

References