Advisoriesby IbisvLLMGHSA-9hcf-v7m4-6m2j
vLLM allows clients to crash the openai server with invalid regex
Fix: upgrade to 0.9.0 or later
Impact
A denial of service bug caused the vLLM server to crash if an invalid regex was provided while using structured output. This vulnerability is similar to [GHSA-6qc9-v4r8-22xg](https://github.com/vllm-project/vllm/security/advisories/GHSA-6qc9-v4r8-22xg), but for regex instead of a JSON schema.
Issue with more details: https://github.com/vllm-project/vllm/issues/17313
Patches
- https://github.com/vllm-project/vllm/pull/17623
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| vllm PyPI | >= 0.8.0, < 0.9.0 | 0.9.0 |
Details and references
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Severity from
- GitHub (reviewed advisory)
- Weakness
- CWE-248
- Also known as
- CVE-2025-48943, PYSEC-2025-55
- github.com/vllm-project/vllm/security/advisories/GHSA-9hcf-v7m4-6m2j
- nvd.nist.gov/vuln/detail/CVE-2025-48943
- github.com/vllm-project/vllm/issues/17313
- github.com/vllm-project/vllm/pull/17623
- github.com/vllm-project/vllm/commit/08bf7840780980c7568c573c70a6a8db94fd45ff
- github.com/pypa/advisory-database/tree/main/vulns/vllm/PYSEC-2025-55.yaml
- github.com/vllm-project/vllm
More vLLM advisories
All vLLM
vLLM Tool Schema allows DoS via Malformed pattern and type FieldsCVE-2025-48944fixed in 0.9.0vLLM DOS: Remotely kill vllm over http with invalid JSON schemaCVE-2025-48942fixed in 0.9.0vLLM has a Weakness in MultiModalHasher Image Hashing ImplementationCVE-2025-46722fixed in 0.9.0Potential Timing Side-Channel Vulnerability in vLLM’s Chunk-Based Prefix CachingCVE-2025-46570fixed in 0.9.0vLLM vulnerable to Regular Expression Denial of ServiceCVE-2025-71379fixed in 0.9.0vLLM: denial of serviceCVE-2025-48887fixed in 0.9.0