Bug 2451990 (CVE-2026-28377)

Summary: CVE-2026-28377 Grafana Tempo: Grafana Tempo: Information disclosure of S3 encryption key via status config endpoint
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: gparvin, lchilton, rhaigner, rhel-process-autobot, sfeifer, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Grafana Tempo. This vulnerability exposes the S3 Server-Side Encryption with Customer-Provided Keys (SSE-C) encryption key in plaintext through the /status/config endpoint. A remote attacker could exploit this to obtain the key, potentially allowing unauthorized access and decryption of sensitive trace data stored in S3.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-03-26 22:02:33 UTC
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.