Grafana Tempo has Inadequate Encryption Strength

GHSA-ffqx-q65f-36jf · CVE-2026-28377 · GO-2026-5359

Published Mar 27, 2026 · Modified Jun 25, 2026

Description

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.

Grafana thanks william_goodfellow for reporting this vulnerability.

References

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-28377
WEB https://github.com/grafana/tempo/commit/bb8ca663db34a0980c9758b40d918fda3b4dbec3
PACKAGE https://github.com/grafana/tempo
WEB https://github.com/grafana/tempo/blob/4dc3e5b0d3463a0b67498b662b85a148698b4afd/CHANGELOG.md?plain=1#L135
WEB https://grafana.com/security/security-advisories/cve-2026-28377

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