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Change History

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.

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CWE-400

CWE-1333

https://github.com/vllm-project/vllm/commit/c9a788eedc412acceaa5112e0d44624b49841577

https://github.com/vllm-project/vllm/pull/47595

https://github.com/vllm-project/vllm/releases/tag/v0.26.0

https://github.com/vllm-project/vllm/security/advisories/GHSA-48jh-3gj7-fg8v

[{"vendor":"vllm-project","product":"vllm","versions":[{"version":"< 0.26.0","status":"affected"}]}]