CVE-2026-73556

A flaw was found in vLLM, an inference and serving engine for large language models. An unauthenticated remote attacker can exploit a Regular Expression Denial of Service ReDoS vulnerability in the lm-format-enforcer backend. By submitting a specially crafted regular expression through the...

CVE-2026-73556

vLLM before 0.26.0 is affected by a DoS-like issue in the lm-format-enforcer backend: structured_outputs.regex is passed to RegexParser without compile_timeout or validation in validate_structured_output_request_lm_format_enforcer, allowing unauthenticated /v1/completions requests to consume CPU ...

CVE-2026-73556 vLLM: ReDoS via structured_outputs.regex in the lm-format-enforcer backend (no compile timeout) — missed sibling of CVE-2026-55574

vLLM is an inference and serving engine for large language models. Prior to 0.26.0, the structuredoutputs.regex parameter in vllm/v1/structuredoutput/backendlmformatenforcer.py is passed to lmformatenforcer.RegexParser without compileregexwithtimeout or validation in...

CVE-2026-73556 vLLM: ReDoS via structured_outputs.regex in the lm-format-enforcer backend (no compile timeout) — missed sibling of CVE-2026-55574

vLLM is an inference and serving engine for large language models. Prior to 0.26.0, the structuredoutputs.regex parameter in vllm/v1/structuredoutput/backendlmformatenforcer.py is passed to lmformatenforcer.RegexParser without compileregexwithtimeout or validation in...

PT-2026-71671

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...