# CVE-2026-126399: vLLM 0.19.0 before 0.31.0 Resource Exhaustion via Request-Level num_frames

Status: published. Published: 2026-11-13. Updated: 2026-11-13.

vLLM from 0.19.0 before 0.31.0 contains a resource exhaustion vulnerability that allows inference clients to bypass the server frame limit by setting media_io_kwargs.video.num_frames in chat completion requests. Attackers can supply num_frames=-1 or a large value with many base64 JPEG frames, forcing VideoMediaIO to decode all frames and np.stack them, causing memory exhaustion.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- vllm-project / vllm (vllm): ≥ 0.19.0; < 0.31.0 (affected, semver); 0.31.0 (unaffected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 7.1 (high); 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; source: CNA: VulnCheck

- CVSS 3.1: 6.5 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H; source: CNA: VulnCheck

- CVSS 4.0: 7.1 (high); 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:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X; source: NVD: disclosure@vulncheck.com

- CVSS 3.1: 6.5 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H; source: NVD: disclosure@vulncheck.com

- CISA KEV: No listing in collected sources

- EPSS: 0.48% as of 2026-11-13; percentile 41.68%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-770

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/vllm-project/vllm/security/advisories/GHSA-vxqj-p4gw-9h4c (CNA: VulnCheck; vendor-advisory)

- https://www.vulncheck.com/advisories/vllm-0.19.0-before-0.31.0-resource-exhaustion-via-request-level-num-frames (CNA: VulnCheck; third-party-advisory)

- https://github.com/vllm-project/vllm/security/advisories/GHSA-vxqj-p4gw-9h4c (disclosure@vulncheck.com)

- https://www.vulncheck.com/advisories/vllm-0.19.0-before-0.31.0-resource-exhaustion-via-request-level-num-frames (disclosure@vulncheck.com)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-126399; retrieved 2026-11-13; source updated 2026-11-13

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-126399; retrieved 2026-11-13; source updated 2026-11-13

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-126399; retrieved 2026-11-13; source updated Not reported

Revision: 8a263adbcf4499f7788793a1f9698eb000bd86e0ffe58361ce1e37faa6da2cf2

Canonical: https://y2.dev/cve/CVE-2026-126399

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