CVE-2026-35030
Description
A flaw was found in LiteLLM, a proxy server for Large Language Model (LLM) APIs. When JSON Web Token (JWT) authentication is enabled, the OIDC user information cache uses a truncated portion of the token as a cache key. An unauthenticated attacker can exploit this by crafting a JWT with the same initial characters as a legitimate user's cached token. This allows the attacker to bypass authentication and inherit the legitimate user's identity and permissions, potentially leading to unauthorized access and privilege escalation.
Statement
This is an Important flaw in LiteLLM that enables authentication bypass and privilege escalation. The vulnerability is present only when JWT authentication is explicitly enabled, as this configuration is not active by default. Red Hat Ansible Automation Platform, Lightspeed Core, Red Hat OpenShift AI, and Ansible Services are affected if configured with JWT authentication.
Mitigation
To mitigate this issue, ensure that JWT authentication is not enabled in LiteLLM configurations. The vulnerability only manifests when `enable_jwt_auth` is set to `true`. If JWT authentication is not strictly required, disable it to prevent potential authentication bypass and privilege escalation. If this configuration is changed, a restart of the LiteLLM service may be required for the changes to take effect.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 9.1 | N/A | 9.1 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | None | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | High | N/A | High |
| Integrity Impact | High | N/A | High |
| Availability Impact | None | N/A | None |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Understanding the Weakness (CWE)
Non-Repudiation
Technical Impact: Hide Activities
The source of an attack will be difficult or impossible to determine. This can allow attacks to the system to continue without notice.
Frequently Asked Questions
Not sure what something means? Check out our Security Glossary.
Want to get errata notifications? Sign up here.
