Vulnerability DatabaseCVE-2026-28377
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CVE-2026-28377
Published:March 26, 2026
Updated:May 18, 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. Thanks to william_goodfellow for reporting this vulnerability.
Affected Packages
https://github.com/grafana/tempo.git (GITHUB):
Affected version(s) >=v0.2.0 <v2.10.3
Fix Suggestion:
Update to version v2.10.3
github.com/grafana/tempo (GO):
Affected version(s) >=v0.0.999-rc-testdeb <v2.10.3
Fix Suggestion:
Update to version v2.10.3
Related Resources (5)
https://github.com/grafana/tempo
https://github.com/grafana/tempo/commit/bb8ca663db34a0980c9758b40d918fda3b4dbec3
https://grafana.com/security/security-advisories/cve-2026-28377
https://nvd.nist.gov/vuln/detail/CVE-2026-28377
https://github.com/grafana/tempo/blob/4dc3e5b0d3463a0b67498b662b85a148698b4afd/CHANGELOG.md?plain=1#L135
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CVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Inadequate Encryption Strength
CWE-326
EPSS
Base Score:
0.01