{"id":"CVE-2026-49998","aliases":["GHSA-g6vg-wj8f-48cj","GO-2026-5872"],"url":"https://o3.security/vulnerability/CVE-2026-49998","summary":"Centrifugo: Dynamic JWKS key cache keyed only by `kid` allows cross-issuer JWT authentication bypass","details":"Centrifugo is an open-source scalable real-time messaging server. Prior to 6.8.1, Centrifugo dynamic JWKS endpoint verification could reuse a key for one allowed issuer to verify a JWT for another allowed issuer because the JWKS cache and singleflight lookup were keyed only by JWT header kid, not by the resolved JWKS endpoint, issuer, audience, or trust-domain namespace, affecting client.token.jwks_public_endpoint, client.subscription_token.jwks_public_endpoint, internal/jwks/cache.go, and internal/jwks/manager.go. This issue is fixed in version 6.8.1.","published":"2026-07-16T19:33:33.147Z","modified":"2026-08-12T03:51:35.606795997Z","cvss":{"score":8.2,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N"},"epss":{"score":0.00266,"percentile":0.18207,"asOf":"2026-08-30"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/centrifugal/centrifugo/v6","fixedVersion":"6.8.1"},{"ecosystem":"Go","name":"github.com/centrifugal/centrifugo/v5","fixedVersion":null},{"ecosystem":"Go","name":"github.com/centrifugal/centrifugo/v4","fixedVersion":null},{"ecosystem":"Go","name":"github.com/centrifugal/centrifugo/v3","fixedVersion":null},{"ecosystem":"Go","name":"github.com/centrifugal/centrifugo","fixedVersion":null}],"fix":{"url":"https://github.com/centrifugal/centrifugo/commit/15d785015c6f318c1b68ea40b813699c9f8bd2c4","label":"centrifugal/centrifugo@15d7850"},"references":[{"type":"WEB","url":"https://github.com/centrifugal/centrifugo/releases/tag/v6.8.1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49998.json"},{"type":"ADVISORY","url":"https://github.com/centrifugal/centrifugo/security/advisories/GHSA-g6vg-wj8f-48cj"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-49998"},{"type":"FIX","url":"https://github.com/centrifugal/centrifugo/commit/15d785015c6f318c1b68ea40b813699c9f8bd2c4"},{"type":"FIX","url":"https://github.com/centrifugal/centrifugo/pull/1142"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:35.606795997Z"}}