CVE-2025-71379

vllm - Regular Expression Denial of Service in Multiple Components

CVSS 5.3 MEDIUMEPSS 0.2%CWE-1333

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 5.3EPSS 0.2%KEV nãoPoC —Nuclei —Metasploit —Patch referenciado

Lifecycle

20 Jun 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Affected products

vllm · vllm

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References

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