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CVE-2026-35030

9.1 · CRITICAL

LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format.

Published Apr 6, 2026CWE-287EPSS 0.88%

Overview

CVE-2026-35030 is a critical-severity vulnerability. It was published on April 6, 2026 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.1, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/BerriAI/litellm/security/advisories/GHSA-jjhc-v7c2-5hh6Refaccess.redhat.com/errata/RHSA-2026:13545Refaccess.redhat.com/errata/RHSA-2026:28960Refaccess.redhat.com/errata/RHSA-2026:30056Refaccess.redhat.com/security/cve/CVE-2026-35030Refbugzilla.redhat.com/show_bug.cgi?id=2455509Refsecurity.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-35030.json

How CyberStrike helps

Frequently asked questions

What is CVE-2026-35030?

CVE-2026-35030 is a critical-severity vulnerability. It was published on April 6, 2026 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

How severe is CVE-2026-35030?

This vulnerability has a CVSS 3.1 base score of 9.1, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-35030?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-35030?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-35030 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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