PatchTheCVECVE-2026-55574: vLLM is a high-throughput and memory-efficient inference and serving engine for LLMs
CVE-2026-55574 is a high-severity flaw (CVSS 7.5) affecting vllm. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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 backrefere
Why this priority
- High severity
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 7.5 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.6% (top 52%) |
| CISA exploited list | No |
| Weakness | CWE-1333 |
| Published | 2026-07-06 |
| Last modified | 2026-10-25 |
Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-55574?
vllm: upgrade to 0.24.0. Exact commands for each OS are on this page.
Is CVE-2026-55574 being exploited?
CVE-2026-55574 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-55574 affect?
CVE-2026-55574 affects vllm. Severity is high (CVSS 7.5). 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 wit
How urgent is CVE-2026-55574?
Priority 43/100. High severity; Remotely exploitable, no login, no user action
Related CVEs
- CVE-2026-54234 HIGH 7.5 UPGRADE vLLM is a high-throughput and memory-efficient inference and serving engine for LLMs
- CVE-2026-55514 MEDIUM 6.5 UPGRADE vLLM is a library for LLM inference and serving
- CVE-2026-55646 MEDIUM 6.5 UPGRADE vLLM is an inference and serving engine for large language models
- CVE-2026-56340 HIGH 8.8 UPGRADE vLLM versions >= 0.10.2 and < 0.13.0 are missing sparse tensor validation in multimodal embeddings processing
- CVE-2026-73560 MEDIUM 6.5 UPGRADE vLLM is an inference and serving engine for large language models