CVE-2026-35030 LiteLLM has an authentication bypass via OIDC userinfo cache key collision

LiteLLM is a proxy server AI Gateway to call LLM APIs in OpenAI or native format. Prior to 1.83.0, when JWT authentication is enabled enablejwtauth: true, the OIDC userinfo cache uses token:20 as the cache key. JWT headers produced by the same signing algorithm generate identical first 20...

Authentication Bypass

litellm is vulnerable to Authentication Bypass. The vulnerability is due to weak cache key generation using only the first 20 characters of JWT tokens, which allows an attacker to craft a token with a matching prefix and gain unauthorized access by inheriting another user’s identity...