CVE-2026-55574— vLLM 资源管理错误漏洞

vLLM: ReDoS via structured_outputs.regex compiled without timeout in xgrammar and outlines backends

vLLM is a high-throughput and memory-efficient inference and serving engine for LLMs. Prior to 0.24.0, the structured_outputs.regex API parameter passes a user-supplied regular expression string directly to the grammar compiler backends with no compilation timeout; in the xgrammar backend the string reaches the regex compiler with no guard, and in the outlines backend the validation step blocks structural issues such as lookarounds and backreferences but performs no complexity analysis, so a pattern with nested quantifiers passes all checks and causes exponential state-space expansion, allowing a single request containing an adversarial regex to hang an inference worker indefinitely and deny service. This issue is fixed in version 0.24.0.

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CWE-1333

vLLM 资源管理错误漏洞

vLLM是vLLM团队开源的一个适用于 LLM 的高吞吐量和内存高效推理和服务引擎。 vLLM 0.24.0之前版本存在资源管理错误漏洞，该漏洞源于structured_outputs.regex API参数将用户提供的正则表达式字符串直接传递给语法编译器后端且无编译超时，导致嵌套量词模式可通过所有检查并引发指数级状态空间扩展，允许单个包含对抗性正则表达式的请求无限挂起推理工作线程造成拒绝服务。

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