LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format.
CVE-2026-35030
Impact When JWT authentication is enabled (enablejwtauth: 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. Patches Fixed in v1.83.0. The cache key now uses the full hash of the JWT token. Workarounds Disable OIDC userinfo caching by setting the cache TTL to 0, or disable JWT authentication entirely.
Proof-of-concept code is published
Public PoC
- Public PoClearner202649/CVE-2026-35030-PoC
Signals come from Exploit-DB, Metasploit, Nuclei and published proof-of-concept repositories. Their absence means nothing was found, not that nothing exists.
Part of the AI stack
This affects LiteLLM, in Inference & serving.
Assessment
- CVSS
- 9.4 (v4.0)
- Severity
- Critical
- EPSS
- 0.63% chance of exploitation in the next 30 days
- Known exploited
- Not listed in CISA KEV
- Exploit availability
- Public PoC
- Published
- 3 April 2026
- Last updated
- 24 October 2026
- Weakness
- CWE-222, CWE-287
- Assigner
- security-advisories@github.com
CVSS vectorCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N
At the source
References
- https://github.com/BerriAI/litellm/security/advisories/GHSA-jjhc-v7c2-5hh6
- https://access.redhat.com/errata/RHSA-2026:13545
- https://access.redhat.com/errata/RHSA-2026:28960
- https://access.redhat.com/errata/RHSA-2026:30056
- https://access.redhat.com/security/cve/CVE-2026-35030
- https://bugzilla.redhat.com/show_bug.cgi?id=2455509
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-35030.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-35030
- https://github.com/advisories/GHSA-jjhc-v7c2-5hh6
Community proofs of concept
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Query this programmatically
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curl https://cve.zerocrew.in/api/cve/CVE-2026-35030