PYSEC-2026-2026
vLLM is vulnerable to timing attack at bearer auth
Quick fix
PYSEC-2026-2026 — vllm: upgrade to the fixed version with the command below.
pip install --upgrade 'vllm>=0.11.0'Details
### Summary The API key support in vLLM performed validation using a method that was vulnerable to a timing attack. This could potentially allow an attacker to discover a valid API key using an approach more efficient than brute force.
### Details https://github.com/vllm-project/vllm/blob/4b946d693e0af15740e9ca9c0e059d5f333b1083/vllm/entrypoints/openai/api_server.py#L1270-L1274
API key validation used a string comparison that will take longer the more characters the provided API key gets correct. Data analysis across many attempts can allow an attacker to determine when it finds the next correct character in the key sequence. ### Impact Deployments relying on vLLM's built-in API key validation are vulnerable to authentication bypass using this technique.
Are you affected?
Enter the version of the package you're using.
Affected packages
References
- https://github.com/vllm-project/vllm/security/advisories/GHSA-wr9h-g72x-mwhm[WEB]
- https://nvd.nist.gov/vuln/detail/CVE-2025-59425[ADVISORY]
- https://github.com/vllm-project/vllm/commit/ee10d7e6ff5875386c7f136ce8b5f525c8fcef48[WEB]
- https://github.com/vllm-project/vllm[PACKAGE]
- https://github.com/vllm-project/vllm/blob/4b946d693e0af15740e9ca9c0e059d5f333b1083/vllm/entrypoints/openai/api_server.py#L1270-L1274[WEB]
- https://github.com/vllm-project/vllm/releases/tag/v0.11.0[WEB]
- https://pypi.org/project/vllm[PACKAGE]
- https://github.com/advisories/GHSA-wr9h-g72x-mwhm[ADVISORY]