Staging Environment: Content and features may be unstable or change without notice.
Advisory details: pypa / vllm/PYSEC-2026-2026
Advisory ID pypa/vllm/PYSEC-2026-2026
Aliases CVE-2025-59425
GHSA-wr9h-g72x-mwhm
PYSEC-2026-2026
Summary vLLM is vulnerable to timing attack at bearer auth ### 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.
Status Published
Exploitability 0.5
Weighted Severity 6.8
Risk 3.4
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (0)
There are no known CWE.
System Score Found at
cvssv3.1 7.5 https://github.com/pypa/advisory-database/blob/main/vulns/vllm/PYSEC-2026-2026.yaml
Reference id Reference type URL
https://github.com/vllm-project/vllm
https://github.com/vllm-project/vllm/blob/4b946d693e0af15740e9ca9c0e059d5f333b1083/vllm/entrypoints/openai/api_server.py#L1270-L1274
https://github.com/vllm-project/vllm/commit/ee10d7e6ff5875386c7f136ce8b5f525c8fcef48
https://github.com/vllm-project/vllm/releases/tag/v0.11.0
https://pypi.org/project/vllm
CVE-2025-59425 https://nvd.nist.gov/vuln/detail/CVE-2025-59425
GHSA-wr9h-g72x-mwhm https://github.com/advisories/GHSA-wr9h-g72x-mwhm
GHSA-wr9h-g72x-mwhm https://github.com/vllm-project/vllm/security/advisories/GHSA-wr9h-g72x-mwhm
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://github.com/pypa/advisory-database/blob/main/vulns/vllm/PYSEC-2026-2026.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none

Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2025-10-07T14:32:10Z/

Decision: Track

Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2025/59xxx/CVE-2025-59425.json

Source Advisory: vulnrichment/CVE-2025-59425

View SSVC decision tree 
[{'Exploitation': 'none'},
 {'Automatable': 'yes'},
 {'Technical Impact': 'partial'},
 {'Mission Prevalence': 'minimal'},
 {'Public Well-being Impact': 'material'},
 {'Mission & Well-being': 'medium'}]