Resource exhaustion in Vllm-project Vllm
CVE-2026-73556
vLLM is an inference and serving engine for large language models. Prior to 0.26.0, the structured_outputs.regex parameter in vllm/v1/structured_output/backend_lm_format_enforcer.py is passed to lmformatenforcer.RegexParser without compile…
Vulnerability class: DoS (Denial of Service)
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
Affected products
- Vllm-project Vllm — versions < 0.26.0
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_CONFIRM)
Frequently asked questions
- What is CVE-2026-73556?
- CVE-2026-73556 is a medium-severity vulnerability in Vllm-project Vllm, classified under Uncontrolled Resource Consumption. CVSS score: 5.3/10. Published 2026-08-13.
- How severe is CVE-2026-73556?
- Medium severity. CVSS v3 base score is 5.3 out of 10.