Cleartext Storage of Sensitive Information Affecting github.com/grafana/tempo/tempodb/backend/s3 package, versions <2.10.3
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published29 Mar 2026
- disclosed26 Mar 2026
- creditUnknown
Introduced: 26 Mar 2026
CVE-2026-28377 Â (opens in a new tab)How to fix?
Upgrade github.com/grafana/tempo/tempodb/backend/s3 to version 2.10.3 or higher.
Overview
Affected versions of this package are vulnerable to Cleartext Storage of Sensitive Information via the /status/config endpoint. An attacker can obtain plaintext S3 Server-Side Encryption with Customer-Provided Keys by sending a request to this endpoint, potentially allowing unauthorized access and decryption of sensitive trace data stored in S3.
Workaround
This vulnerability can be mitigated by restricting network access to the service to trusted networks only and configuring firewall rules to prevent external access. Ensure network restrictions persist across service reloads or system restarts.