Resource exhaustion in vLLM - CVE-2026-126394
Published: November 9, 2026 / Updated: November 13, 2026
Vulnerability identifier: #VU162997
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-126394
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows an unauthenticated remote attacker to exhaust memory and CPU resources on video-capable vLLM deployments, degrading service availability.
The vulnerability exists due to missing limits on request-controlled num_frames in OpenCVDynamicOpenPanguVideoBackend when a negative fps bypasses the sampling bound. An unauthenticated remote attacker can submit a video request to /v1/chat/completions, select the backend through media_io_kwargs.video.video_backend, and supply an excessive frame count to trigger resource-intensive processing without victim interaction.
Affected software
vLLM
How to mitigate CVE-2026-126394
Install security update from vendor's website.
vLLM - update to 0.31.0