User Impersonation Affecting litellm package, versions [1.80.7,1.83.0)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PYTHON-LITELLM-15907831
- published5 Apr 2026
- disclosed3 Apr 2026
- creditveria-labs
Introduced: 3 Apr 2026
NewCVE-2026-35030 (opens in a new tab)How to fix?
Upgrade litellm to version 1.83.0 or higher.
Overview
litellm is a Library to easily interface with LLM API providers
Affected versions of this package are vulnerable to User Impersonation in the get_oidc_userinfo function. An attacker can gain unauthorized access to another user's identity and permissions by crafting a token with the same initial 20 characters as a legitimate user's cached token.
Note: This is only exploitable if JWT/OIDC authentication is enabled and the OIDC userinfo cache is active.
Workaround
This vulnerability can be mitigated by disabling OIDC userinfo caching (set cache TTL to 0) or disabling JWT authentication entirely.