Reachable assertion in vLLM - CVE-2026-55514
Published: July 2, 2026
Vulnerability identifier: #VU136684
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-55514
CWE-ID: CWE-617
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: vLLM
Affected software:
vLLM
vLLM
Detailed vulnerability description
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a reachable assertion. A remote user can send a pure prompt embeds payload in a "/v1/completions" request with a model using M-RoPE and cause a denial of service condition on the target system.
How to mitigate CVE-2026-55514
Install updates from vendor's website.