CVE-2026-35030: LiteLLM authentication bypass via OIDC cache collision

# CVE-2026-35030: LiteLLM authentication bypass via OIDC cache collision

https://gcdradar.vercel.app/incidents/cve-2026-35030-litellm-authentication-bypass-via-oidc-cache · AIR-2026-0551 · closed 2026-04-03

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2026-04-03
- AI role: Attack on AI
- Products: LiteLLM
- CVE ids: CVE-2026-35030
- CVSS: 9.4

## Summary

A cache key collision issue in LiteLLM permits attackers to impersonate legitimate users when JWT authentication is enabled. A patch has been released by the maintainers.

## What to do

No action recorded; read the sources below and the vendor's advisory.

## Latest updates

- 2026-04-06: CVE-2026-35030: LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. (https://nvd.nist.gov/vuln/detail/CVE-2026-35030)
- 2026-04-03: CVE-2026-35030: LiteLLM: Authentication bypass via OIDC userinfo cache key collision (https://github.com/advisories/GHSA-jjhc-v7c2-5hh6)

## Sources

- 2026-04-03 GitHub Advisory Database: CVE-2026-35030: LiteLLM: Authentication bypass via OIDC userinfo cache key collision https://github.com/advisories/GHSA-jjhc-v7c2-5hh6
- 2026-04-06 NVD: CVE-2026-35030: LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. https://nvd.nist.gov/vuln/detail/CVE-2026-35030

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