Medium 4.3Published Jun 20, 2026

CVE-2025-71379vllm - Regular Expression Denial of Service in Multiple Components

Updated under an hour ago (Oct 28, 2026, 2:00 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for vllm

Exploited in the last 30 days

vLLM versions >= 0.6.3 and < 0.9.0 contain multiple regular expression denial of service (ReDoS) vulnerabilities. Several regex patterns — in vllm/lora/utils.py, the phi4mini tool parser, and the OpenAI-compatible serving chat endpoint — are susceptible to catastrophic backtracking. An attacker submitting crafted input with nested or repeated structures can trigger severe CPU consumption and performance degradation, resulting in denial of service.

CVSS: 4.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Weakness (CWE): CWE-1333
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Analyzed
Record last updated: Jun 22, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

vllm vllm vllm:vllm (from the name)	from 0.6.3 before 0.9.0; 0.9.0 not affected	CNA record
vllm vllm vllm:vllm	from 0.6.3 before 0.9.0	NVD

References

References

https://github.com/vllm-project/vllm/security/advisories/GHSA-j828-28rj-hfhp	vendor-advisory, exploit
https://www.vulncheck.com/advisories/vllm-regular-expression-denial-of-service-in-multiple-components	third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.