What is CVE-2026-28377?

CVE-2026-28377 is a high-severity vulnerability in Grafana Tempo, classified under Inadequate Encryption Strength. CVSS score: 7.5/10. Published 2026-03-26.

How severe is CVE-2026-28377?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Grafana Tempo

CVE-2026-28377

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. Thanks to william_go…

EPSS: 0.002 (5.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Grafana Tempo — versions 2.10.3

Weakness classification (CWE)

CWE-326 — Inadequate Encryption Strength

References

security@grafana.com (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-28377?: CVE-2026-28377 is a high-severity vulnerability in Grafana Tempo, classified under Inadequate Encryption Strength. CVSS score: 7.5/10. Published 2026-03-26.
How severe is CVE-2026-28377?: High severity. CVSS v3 base score is 7.5 out of 10.