CVE Watch7 jul 2026

CVE-2026-55574

vLLM is a high-throughput and memory-efficient inference and serving engine for LLMs. Prior to 0.24.0, the structured_outputs.regex API para

CVSS

7.5

Alto

EPSS

0.3%

p25

KEV

—

Exploit Today

0-100

Publicado: 6 jul 2026 · Última mod.: 7 jul 2026 · CWE-1333

EPSS · 30d

0.3%EPSS · 30 días0.3%

2026-07-072026-07-21

Descripción técnica

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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