Auth bypass in Berriai Litellm

CVE-2026-35030

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 produc…

Vulnerability class: Broken Authentication

EPSS: 0.005 (39.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2026-35030?
CVE-2026-35030 is a critical-severity vulnerability in Berriai Litellm, classified under Improper Authentication. CVSS score: 9.1/10. Published 2026-04-06.
How severe is CVE-2026-35030?
Critical severity. CVSS v3 base score is 9.1 out of 10.
Is CVE-2026-35030 known to be exploited?
1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.