#VU124863 Server-Side Request Forgery (SSRF) in vLLM - CVE-2026-25960
Published: April 4, 2026
Vulnerability identifier: #VU124863
Vulnerability risk: Low
CVSSv4.0: 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
CVE-ID: CVE-2026-25960
CWE-ID: CWE-918
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
vLLM
vLLM
Software vendor:
vLLM
vLLM
Description
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 security update from vendor's website.