github.com
https://github.com/vllm-project/vllm/commit/c9a788eedc412acceaa5112e0d44624b49841577 CVE-2026-73556
MEDIUM
vLLM: ReDoS via structured_outputs.regex in the lm-format-enforcer backend (no compile timeout) — missed sibling of CVE-2026-55574
Record summary
CVE-2026-73556 has a selected CVSS score of 5.3 (medium).
Description
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_regex_with_timeout or validation in validate_structured_output_request_lm_format_enforcer, allowing an unauthenticated /v1/completions request against the lm-format-enforcer backend to consume a CPU core and stall the structured-output engine path with a catastrophic regular expression. This issue is fixed in version 0.26.0.
Description source: CVE List
Affected products and versions
1| Product | Source | Version range | Status |
|---|---|---|---|
| CVE List | < 0.26.0 | affected |
References
4github.com
https://github.com/vllm-project/vllm/pull/47595 github.com
https://github.com/vllm-project/vllm/releases/tag/v0.26.0 github.comConfirmation
https://github.com/vllm-project/vllm/security/advisories/GHSA-48jh-3gj7-fg8v