---
id: CVE-2026-28377
aliases:
  - GHSA-ffqx-q65f-36jf
  - GO-2026-5359
title: Grafana Tempo has Inadequate Encryption Strength
summary: Grafana Tempo has Inadequate Encryption Strength
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'
vendor: grafana
product: github.com/grafana/tempo
ecosystem: go
affected:
  - github.com/grafana/tempo < 2.10.3
patched:
  - github.com/grafana/tempo 2.10.3
published: '2026-03-27'
updated: '2026-07-09'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-ffqx-q65f-36jf'
references:
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-28377'
  - url: >-
      https://github.com/grafana/tempo/commit/bb8ca663db34a0980c9758b40d918fda3b4dbec3
  - url: 'https://github.com/grafana/tempo'
  - url: >-
      https://github.com/grafana/tempo/blob/4dc3e5b0d3463a0b67498b662b85a148698b4afd/CHANGELOG.md?plain=1#L135
  - url: 'https://grafana.com/security/security-advisories/cve-2026-28377'
tags:
  - osv
  - go
epss: 0.00164
epssPercentile: 0.04931
ingestedAt: '2026-07-09T18:56:36.347Z'
---

## Overview

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.

## Affected packages

- `github.com/grafana/tempo < 2.10.3`

## Remediation

Upgrade to a patched release:

- `github.com/grafana/tempo 2.10.3`