CVE-2026-126397

HIGH 7.5

vLLM 0.10.1 before 0.31.0 Cohere2 Vision DoS via max_patches

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

vLLM from 0.10.1 before 0.31.0 forwards a request-controlled mm_processor_kwargs.max_patches value to the Hugging Face processor for Cohere2 Vision models without a server-side upper bound, causing quadratic CPU work during multimodal preprocessing. Remote clients can send small image chat-completion requests with large, varying max_patches values to bypass the LRU cache, exhaust preprocessing workers, and deny service to other clients.

CWE	CWE-400
Vendor	vllm-project
Product	vllm
Published	Nov 13, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

vllm-project / vllm

0.10.1 < 0.31.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/vllm-project/vllm/security/advisories/GHSA-9g3c-x747-c6wr github.com: https://github.com/vllm-project/vllm/commit/f6326f53bda46898a331c2d24500332c285d9a2b vulncheck.com: https://www.vulncheck.com/advisories/vllm-0.10.1-before-0.31.0-cohere2-vision-dos-via-max-patches

Credits

🔍 0xbbdd jperezdealgaba