vLLM is an inference and serving engine for large language models.
CVE-2026-115917
Summary The OpenAI-compatible server registers Starlette CORSMiddleware with allowedorigins defaulting to [""], and performs no authentication unless --api-key (or VLLMAPIKEY) is configured. A web page on any origin can send requests to a vLLM server that the victim's browser can reach (for example localhost or an internal/VPN address) and read the responses. The default allowcredentials=False blocks cookie-bearing cross-origin requests; because vLLM authenticates with a bearer header rather than cookies, the wildcard still permits untokenized access to an unauthenticated server and read access when the caller already holds a token. Details Affected components vllm/entrypoints/launchers/cliargs.py - allowedorigins default value. vllm/entrypoints/serve/middleware/register.py - CORSMiddleware registration. vllm/entrypoints/serve/middleware/authenticate.py - auth middleware and its guarded path prefixes. Root cause vllm/entrypoints/launchers/cliargs.py: python allowcredentials: bool = False """Allow credentials.""" allowedorigins: list[str] = field(defaultfactory=lambda: [""]) """Allowed origins.""" vllm/entrypoints/serve/middleware/register.py: python app.addmiddleware(…
Part of the AI stack
This affects vLLM, in Inference & serving.
Assessment
- CVSS
- 4.7 (v3.1)
- Severity
- Medium
- EPSS
- 0.0024% chance of exploitation in the next 30 days
- Known exploited
- Not listed in CISA KEV
- Exploit availability
- Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
- Published
- 26 October 2026
- Last updated
- 31 October 2026
- Affected
- pip · vllm
- Weakness
- CWE-942
- Assigner
- security-advisories@github.com
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N
At the source
References
- https://github.com/vllm-project/vllm/commit/fcae5c98870ff2c20659731dce7ba3a3ff0d48aa
- https://github.com/vllm-project/vllm/pull/61009
- https://github.com/vllm-project/vllm/releases/tag/v0.32.0
- https://github.com/vllm-project/vllm/security/advisories/GHSA-vvpg-rrww-wpmh
- https://nvd.nist.gov/vuln/detail/CVE-2026-115917
- https://github.com/advisories/GHSA-vvpg-rrww-wpmh
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