CVE-2026-35030

Description

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 (enable_jwt_auth: true), the OIDC userinfo cache uses token[:20] as the cache key. JWT headers produced by the same signing algorithm generate identical first 20 characters. This configuration option is not enabled by default. Most instances are not affected. An unauthenticated attacker can craft a token whose first 20 characters match a legitimate user's cached token. On cache hit, the attacker inherits the legitimate user's identity and permissions. This affects deployments with JWT/OIDC authentication enabled. Fixed in v1.83.0.

References

https://latesthackingnews.com/2026/06/16/litellm-vulnerability-chain-ai-gateway-patch/

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-35030.json

https://github.com/BerriAI/litellm/security/advisories/GHSA-jjhc-v7c2-5hh6

https://bugzilla.redhat.com/show_bug.cgi?id=2455509

https://access.redhat.com/security/cve/CVE-2026-35030

https://access.redhat.com/errata/RHSA-2026:30056

https://access.redhat.com/errata/RHSA-2026:28960

https://access.redhat.com/errata/RHSA-2026:13545

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

CVSS v4

EPSS