{"cve":"CVE-2026-35030","nvd":{"published":"2026-04-06T17:17:12.650","modified":"2026-10-24T13:10:00.147","status":"Modified","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.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N","score":9.4},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","score":9.1},"cwes":["CWE-287","CWE-222"],"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"],"products":["litellm:litellm"],"source":"nvd","synced_at":"2026-10-24T16:53:27.712498749+00:00"},"epss":{"cve":"CVE-2026-35030","score":0.00625,"percentile":0.49685,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-jjhc-v7c2-5hh6","url":"https://osv.dev/vulnerability/GHSA-jjhc-v7c2-5hh6","summary":"LiteLLM: Authentication bypass via OIDC userinfo cache key collision","modified":"2026-09-10T03:50:44.584849813Z","packages":[{"ecosystem":"PyPI","name":"litellm","purl":"pkg:pypi/litellm","ranges":["<1.83.0"],"fixed":["1.83.0"]}]},{"id":"PYSEC-2026-390","url":"https://osv.dev/vulnerability/PYSEC-2026-390","summary":"LiteLLM: Authentication bypass via OIDC userinfo cache key collision","modified":"2026-07-01T20:22:56.400828Z","packages":[{"ecosystem":"PyPI","name":"litellm","purl":"pkg:pypi/litellm","ranges":["<1.83.0"],"fixed":["1.83.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}