CVE-2026-28377: Github.com/grafana/tempo Grafana Tempo Has Inadequate Encryption Vulnerability

HIGH
Advisory Identifier: GHSA-ffqx-q65f-36jf
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CVSS 7.5
CWE-326
Published
Advisory Summary

CVE-2026-28377 is a HIGH (CVSS 7.5) grafana tempo has inadequate encryption vulnerability (CWE-326: Inadequate Encryption Strength) affecting Github.com/grafana/tempo libraries in the Go ecosystem. The issue involves grafana tempo has inadequate encryption strength. Remediation is available by upgrading affected packages to version 2.10.3.

CVE-2026-28377 at a Glance

CVE Identifier CVE-2026-28377
GHSA Identifier GHSA-ffqx-q65f-36jf
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-326: Inadequate Encryption Strength
Affected Product Github.com/grafana/tempo
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 7.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2026-28377

To remediate this vulnerability, upgrade all affected Github.com/grafana/tempo dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

github.com/grafana/tempo fixed: 2.10.3 
Upgrade github.com/grafana/tempo to 2.10.3
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for github.com/grafana/tempo

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-28377, inspect your project dependencies for Github.com/grafana/tempo:

inspect dependencies for github.com/grafana/tempo

Analyze the terminal output to locate any version of Github.com/grafana/tempo in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.10.3), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-326: Inadequate Encryption Strength, where the product stores or transmits sensitive data using an encryption scheme that is theoretically sound, but is not strong enough for the level of protection required. In Github.com/grafana/tempo, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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.

CVE-2026-28377 Affected Github.com/grafana/tempo Versions

1 component(s)
Fixed Versions:
2.10.3
Product / Package Ecosystem Affected Versions Fixed Version
github.com/grafana/tempo
golang/github.com/grafana/tempo
Go
< 2.10.3
2.10.3

References

NVD — CVE-2026-28377 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-28377
Security Fix Commit FIX COMMIT
https://github.com/grafana/tempo/commit/bb8ca663db34a0980c9758b40d918fda3b4dbec3
GitHub Advisory / Wiki ADVISORY
https://github.com/advisories/GHSA-ffqx-q65f-36jf
Github.com/grafana/tempo Source Repository REPOSITORY
https://github.com/grafana/tempo
Github.com/grafana/tempo Source Repository REPOSITORY
https://github.com/grafana/tempo/blob/4dc3e5b0d3463a0b67498b662b85a148698b4afd/CHANGELOG.md?plain=1#L135
Github.com/grafana/tempo Security Information SECURITY
https://grafana.com/security/security-advisories/cve-2026-28377

Frequently Asked Questions

What is CVE-2026-28377?
CVE-2026-28377 is a security vulnerability in Github.com/grafana/tempo involving Grafana Tempo has Inadequate Encryption Strength under CWE-326: Inadequate Encryption Strength.
Which Github.com/grafana/tempo versions are affected?
Affected versions include releases prior to 2.10.3 across affected packages: github.com/grafana/tempo.
What version fixes CVE-2026-28377?
Upgrading to 2.10.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/grafana/tempo affected?
Yes, github.com/grafana/tempo is affected in releases prior to 2.10.3. Upgrade your dependency to 2.10.3 or later.
What is the CVSS score of CVE-2026-28377?
CVE-2026-28377 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
What CWE is associated with CVE-2026-28377?
CVE-2026-28377 is classified under CWE-326: Inadequate Encryption Strength (The product stores or transmits sensitive data using an encryption scheme that is theoretically sound, but is not strong enough for the level of protection required.).
How can I check Go dependencies for CVE-2026-28377?
Run the dependency tree command: 'inspect dependencies for github.com/grafana/tempo'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-ffqx-q65f-36jf",
  "modified" : "2026-07-21T14:00:17Z",
  "published" : "2026-03-27T00:31:20Z",
  "aliases" : [ "CVE-2026-28377" ],
  "summary" : "Grafana Tempo has Inadequate Encryption Strength",
  "details" : "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.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/grafana/tempo"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.10.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-28377"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/grafana/tempo/commit/bb8ca663db34a0980c9758b40d918fda3b4dbec3"
  }, {
    "type" : "ADVISORY",
    "url" : "https://github.com/advisories/GHSA-ffqx-q65f-36jf"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/grafana/tempo"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/grafana/tempo/blob/4dc3e5b0d3463a0b67498b662b85a148698b4afd/CHANGELOG.md?plain=1#L135"
  }, {
    "type" : "WEB",
    "url" : "https://grafana.com/security/security-advisories/cve-2026-28377"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-326" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-05-07T04:07:51Z",
    "nvd_published_at" : "2026-03-26T22:16:28Z"
  }
}