CVE-2025-48943

vLLM is an inference and serving engine for large language models (LLMs). Version 0.8.0 up to but excluding 0.9.0 have a Denial of Service (ReDoS) that causes the vLLM server to crash if an invalid regex was provided while using structured output. This vulnerability is similar to GHSA-6qc9-v4r8-22xg/CVE-2025-48942, but for regex instead of a JSON schema. Version 0.9.0 fixes the issue.

• CWE-248

• https://github.com/vllm-project/vllm/commit/08bf7840780980c7568c573c70a6a8db94fd45ffPatch
• https://github.com/vllm-project/vllm/issues/17313Issue Tracking
• https://github.com/vllm-project/vllm/pull/17623Issue Tracking, Patch
• https://github.com/vllm-project/vllm/security/advisories/GHSA-9hcf-v7m4-6m2jVendor Advisory

Published

May 30, 2025

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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