vLLMGHSA-9hcf-v7m4-6m2j
vLLM allows clients to crash the openai server with invalid regex
Medium6.5CVE-2025-48943 · Published May 28, 2025 · updated Aug 7, 2026
### 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| Date | Advisory | Severity | Fixed in |
|---|---|---|---|
| May 282025 | vLLM Tool Schema allows DoS via Malformed pattern and type Fields Medium6.5May 28, 2025 | Medium6.5 | 0.9.0 |
| May 282025 | vLLM DOS: Remotely kill vllm over http with invalid JSON schemaMedium6.5May 28, 2025 | Medium6.5 | 0.9.0 |
| May 282025 | vLLM has a Weakness in MultiModalHasher Image Hashing ImplementationMedium4.2May 28, 2025 | Medium4.2 | 0.9.0 |
| May 282025 | Potential Timing Side-Channel Vulnerability in vLLM’s Chunk-Based Prefix CachingLow2.6May 28, 2025 | Low2.6 | 0.9.0 |
| May 282025 | vLLM vulnerable to Regular Expression Denial of ServiceMedium4.3May 28, 2025 | Medium4.3 | 0.9.0 |
| May 282025 | vLLM: denial of serviceMedium6.5May 28, 2025 | Medium6.5 | 0.9.0 |