Allocation of Resources Without Limits or Throttling in vLLM - CVE-2026-126399
Published: November 9, 2026 / Updated: November 13, 2026
Vulnerability identifier: #VU162986
CSH Severity: Low
CVSS v4: 7.1 [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]
CVE-ID: CVE-2026-126399
CWE-ID: CWE-770
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a low-privileged remote attacker to bypass frame limits and increase memory consumption in vLLM deployments serving video-capable multimodal models.
The vulnerability exists due to request-level media_io_kwargs.video.num_frames overriding the server's frame ceiling during JPEG video decoding. A low-privileged remote attacker can submit a video request with this value set to -1 to decode every supplied frame, using a valid inference API key when authentication is configured.
Affected software
vLLM
How to mitigate CVE-2026-126399
Install security update from vendor's website.
vLLM - update to 0.31.0