{"id":"CVE-2026-28377","aliases":["GHSA-ffqx-q65f-36jf","GO-2026-5359"],"url":"https://o3.security/vulnerability/CVE-2026-28377","summary":"S3 SSE-C Encryption Key Exposed in Plaintext via Config Endpoint (CVE-2025-41118 Pattern)","details":"A vulnerability in Grafana Tempo exposes the S3 SSE-C encryption key in plaintext through the /status/config endpoint, potentially allowing unauthorized users to obtain the key used to encrypt trace data stored in S3.\n\nThanks to william_goodfellow for reporting this vulnerability.","published":"2026-03-26T21:39:46.928Z","modified":"2026-08-28T11:30:53.525962550Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"},"epss":{"score":0.00155,"percentile":0.04977,"asOf":"2026-09-15"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/grafana/tempo","fixedVersion":"2.10.3"}],"fix":{"url":"https://github.com/grafana/tempo/commit/bb8ca663db34a0980c9758b40d918fda3b4dbec3","label":"grafana/tempo@bb8ca66"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/28xxx/CVE-2026-28377.json"},{"type":"ADVISORY","url":"https://grafana.com/security/security-advisories/cve-2026-28377"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-28377"},{"type":"WEB","url":"https://github.com/grafana/tempo/commit/bb8ca663db34a0980c9758b40d918fda3b4dbec3"},{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-ffqx-q65f-36jf"},{"type":"PACKAGE","url":"https://github.com/grafana/tempo"},{"type":"WEB","url":"https://github.com/grafana/tempo/blob/4dc3e5b0d3463a0b67498b662b85a148698b4afd/CHANGELOG.md?plain=1#L135"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-28T11:30:53.525962550Z"}}