CVE-2026-28377: Grafana Tempo has Inadequate Encryption Strength

March 27, 2026 (updated May 7, 2026)

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

github.com/advisories/GHSA-ffqx-q65f-36jf
github.com/grafana/tempo/blob/4dc3e5b0d3463a0b67498b662b85a148698b4afd/CHANGELOG.md?plain=1
github.com/grafana/tempo/commit/bb8ca663db34a0980c9758b40d918fda3b4dbec3
grafana.com/security/security-advisories/cve-2026-28377
nvd.nist.gov/vuln/detail/CVE-2026-28377

Code Behaviors & Features

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