CVE-2026-115917: vLLM permissive CORS configuration vulnerability

# CVE-2026-115917: vLLM permissive CORS configuration vulnerability

https://gcdradar.vercel.app/incidents/cve-2026-115917-vllm-permissive-cors-configuration-vulnerabi · AIR-2026-1539 · closed 2026-10-26

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability): Disclosed vulnerability with a patch available and no confirmed exploitation.
- Fix status: Patched
- First reported: 2026-10-26
- AI role: Attack on AI
- Products: vLLM
- CVE ids: CVE-2026-115917
- CVSS: 3.4

## Summary

The OpenAI-compatible server in vLLM configures Starlette CORSMiddleware with a wildcard origin by default. Malicious web pages can reach unauthenticated local servers and consume resources.

## What to do

Update to vLLM 0.32.0 or later.

## Affected and fixed versions

- Affected: vLLM < 0.32.0
- Fixed in: vLLM 0.32.0

## Latest updates

- 2026-10-28: GitHub advisory published (https://github.com/advisories/GHSA-vvpg-rrww-wpmh)
- 2026-10-26: CVE-2026-115917: vLLM is an inference and serving engine for large language models. (https://nvd.nist.gov/vuln/detail/CVE-2026-115917)

## Sources

- 2026-10-26 NVD: CVE-2026-115917: vLLM is an inference and serving engine for large language models. https://nvd.nist.gov/vuln/detail/CVE-2026-115917
- 2026-10-28 GitHub Advisory Database: CVE-2026-115917: vLLM: Permissive default CORS origins allow cross-origin requests to the vLLM HTTP server https://github.com/advisories/GHSA-vvpg-rrww-wpmh

Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.