CVE-2026-42151: Github.com/prometheus/prometheus Prometheus Azure AD Remote Write Vulnerability

HIGH
Advisory Identifier: GHSA-wg65-39gg-5wfj
Share
CVSS 7.5
CWE-312 CWE-200 CWE-256
Published
Advisory Summary

CVE-2026-42151 is a HIGH (CVSS 7.5) prometheus azure ad remote write vulnerability (CWE-312: Cleartext Storage of Sensitive Information) affecting Github.com/prometheus/prometheus libraries in the Go ecosystem. The issue involves prometheus azure ad remote write oauth client secret exposed via config api. Remediation is available by upgrading affected packages to version 0.311.3.

CVE-2026-42151 at a Glance

CVE Identifier CVE-2026-42151
GHSA Identifier GHSA-wg65-39gg-5wfj
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-312: Cleartext Storage of Sensitive Information
Affected Product Github.com/prometheus/prometheus
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-2026-42151

To remediate this vulnerability, upgrade all affected Github.com/prometheus/prometheus 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/prometheus/prometheus fixed: 0.311.3 
Upgrade github.com/prometheus/prometheus to 0.311.3
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/prometheus/prometheus

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-42151, inspect your project dependencies for Github.com/prometheus/prometheus:

inspect dependencies for github.com/prometheus/prometheus

Analyze the terminal output to locate any version of Github.com/prometheus/prometheus in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.311.3), 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-312: Cleartext Storage of Sensitive Information, where the product stores sensitive information in cleartext within a resource that might be accessible to another control sphere. In Github.com/prometheus/prometheus, 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

### Impact Users who use Azure AD remote write with OAuth authentication are impacted. The `client_secret` field in the Azure AD remote write OAuth configuration (`storage/remote/azuread`) was typed as `string` instead of `Secret`. Prometheus redacts fields of type `Secret` when serving the configuration via the `/-/config` HTTP API endpoint. Because the field was a plain string, the Azure OAuth client secret was exposed in plaintext to any user or process with access to that endpoint. ### Patches The problem has been patched by changing `ClientSecret` in `OAuthConfig` to `Secret`. Users should upgrade to 3.11.3 or 3.5.3 LTS. ### Workarounds Users who can not upgrade can switch to Managed Identity or Workload Identity authentication for Azure AD remote write, which do not involve a client secret.

CVE-2026-42151 Affected Github.com/prometheus/prometheus Versions

1 component(s)
Fixed Versions:
0.311.3
Product / Package Ecosystem Affected Versions Fixed Version
github.com/prometheus/prometheus
golang/github.com/prometheus/prometheus
Go
≥ 0.45.2
< 0.311.3
0.311.3

References

GitHub Advisory / Wiki ADVISORY
https://github.com/prometheus/prometheus/security/advisories/GHSA-wg65-39gg-5wfj
NVD — CVE-2026-42151 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-42151
Github.com/prometheus/prometheus Source Repository REPOSITORY
https://github.com/prometheus/prometheus/pull/18590
Github.com/prometheus/prometheus Source Repository REPOSITORY
https://github.com/prometheus/prometheus/pull/18587
access.redhat.com/errata/rhsa-2026:60... WEB
https://access.redhat.com/errata/RHSA-2026:60388
access.redhat.com/errata/rhsa-2026:60... WEB
https://access.redhat.com/errata/RHSA-2026:60387
access.redhat.com/errata/rhsa-2026:60... WEB
https://access.redhat.com/errata/RHSA-2026:60386
access.redhat.com/errata/rhsa-2026:57... WEB
https://access.redhat.com/errata/RHSA-2026:57191
access.redhat.com/errata/rhsa-2026:56... WEB
https://access.redhat.com/errata/RHSA-2026:56340
access.redhat.com/errata/rhsa-2026:54... WEB
https://access.redhat.com/errata/RHSA-2026:54427
access.redhat.com/errata/rhsa-2026:54... WEB
https://access.redhat.com/errata/RHSA-2026:54288
access.redhat.com/errata/rhsa-2026:53... WEB
https://access.redhat.com/errata/RHSA-2026:53530
access.redhat.com/errata/rhsa-2026:53... WEB
https://access.redhat.com/errata/RHSA-2026:53415
access.redhat.com/errata/rhsa-2026:53... WEB
https://access.redhat.com/errata/RHSA-2026:53413
access.redhat.com/errata/rhsa-2026:53... WEB
https://access.redhat.com/errata/RHSA-2026:53412
access.redhat.com/errata/rhsa-2026:50... WEB
https://access.redhat.com/errata/RHSA-2026:50874
access.redhat.com/errata/rhsa-2026:50... WEB
https://access.redhat.com/errata/RHSA-2026:50843
access.redhat.com/errata/rhsa-2026:60... WEB
https://access.redhat.com/errata/RHSA-2026:60389
access.redhat.com/errata/rhsa-2026:60... WEB
https://access.redhat.com/errata/RHSA-2026:60390
access.redhat.com/errata/rhsa-2026:60... WEB
https://access.redhat.com/errata/RHSA-2026:60391
access.redhat.com/errata/rhsa-2026:60... WEB
https://access.redhat.com/errata/RHSA-2026:60441
access.redhat.com/errata/rhsa-2026:60... WEB
https://access.redhat.com/errata/RHSA-2026:60477
access.redhat.com/errata/rhsa-2026:63... WEB
https://access.redhat.com/errata/RHSA-2026:63103
Github.com/prometheus/prometheus Security Information SECURITY
https://access.redhat.com/security/cve/CVE-2026-42151
bugzilla.redhat.com/show_bug.cgi WEB
https://bugzilla.redhat.com/show_bug.cgi?id=2466507
Github.com/prometheus/prometheus Source Repository REPOSITORY
https://github.com/prometheus/prometheus
Github.com/prometheus/prometheus Release RELEASE
https://github.com/prometheus/prometheus/releases/tag/v3.11.3
Github.com/prometheus/prometheus Release RELEASE
https://github.com/prometheus/prometheus/releases/tag/v3.5.3
Github.com/prometheus/prometheus Security Information SECURITY
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42151.json
access.redhat.com/errata/rhsa-2026:25... WEB
https://access.redhat.com/errata/RHSA-2026:25039
access.redhat.com/errata/rhsa-2026:25... WEB
https://access.redhat.com/errata/RHSA-2026:25245
access.redhat.com/errata/rhsa-2026:25... WEB
https://access.redhat.com/errata/RHSA-2026:25504
access.redhat.com/errata/rhsa-2026:34... WEB
https://access.redhat.com/errata/RHSA-2026:34357
access.redhat.com/errata/rhsa-2026:34... WEB
https://access.redhat.com/errata/RHSA-2026:34359
access.redhat.com/errata/rhsa-2026:36... WEB
https://access.redhat.com/errata/RHSA-2026:36651
access.redhat.com/errata/rhsa-2026:36... WEB
https://access.redhat.com/errata/RHSA-2026:36796
access.redhat.com/errata/rhsa-2026:36... WEB
https://access.redhat.com/errata/RHSA-2026:36797
access.redhat.com/errata/rhsa-2026:37... WEB
https://access.redhat.com/errata/RHSA-2026:37267
access.redhat.com/errata/rhsa-2026:37... WEB
https://access.redhat.com/errata/RHSA-2026:37271
access.redhat.com/errata/rhsa-2026:37... WEB
https://access.redhat.com/errata/RHSA-2026:37272
access.redhat.com/errata/rhsa-2026:40... WEB
https://access.redhat.com/errata/RHSA-2026:40118
access.redhat.com/errata/rhsa-2026:40... WEB
https://access.redhat.com/errata/RHSA-2026:40262
access.redhat.com/errata/rhsa-2026:40... WEB
https://access.redhat.com/errata/RHSA-2026:40768
access.redhat.com/errata/rhsa-2026:40... WEB
https://access.redhat.com/errata/RHSA-2026:40945
access.redhat.com/errata/rhsa-2026:40... WEB
https://access.redhat.com/errata/RHSA-2026:40970
access.redhat.com/errata/rhsa-2026:40... WEB
https://access.redhat.com/errata/RHSA-2026:40972
access.redhat.com/errata/rhsa-2026:40... WEB
https://access.redhat.com/errata/RHSA-2026:40974
access.redhat.com/errata/rhsa-2026:41... WEB
https://access.redhat.com/errata/RHSA-2026:41019
access.redhat.com/errata/rhsa-2026:41... WEB
https://access.redhat.com/errata/RHSA-2026:41030
access.redhat.com/errata/rhsa-2026:41... WEB
https://access.redhat.com/errata/RHSA-2026:41031
access.redhat.com/errata/rhsa-2026:41... WEB
https://access.redhat.com/errata/RHSA-2026:41066
access.redhat.com/errata/rhsa-2026:42... WEB
https://access.redhat.com/errata/RHSA-2026:42146
access.redhat.com/errata/rhsa-2026:42... WEB
https://access.redhat.com/errata/RHSA-2026:42796
access.redhat.com/errata/rhsa-2026:42... WEB
https://access.redhat.com/errata/RHSA-2026:42852
access.redhat.com/errata/rhsa-2026:43... WEB
https://access.redhat.com/errata/RHSA-2026:43052
access.redhat.com/errata/rhsa-2026:44... WEB
https://access.redhat.com/errata/RHSA-2026:44622
access.redhat.com/errata/rhsa-2026:47... WEB
https://access.redhat.com/errata/RHSA-2026:47149
access.redhat.com/errata/rhsa-2026:47... WEB
https://access.redhat.com/errata/RHSA-2026:47952

Frequently Asked Questions

What is CVE-2026-42151?
CVE-2026-42151 is a security vulnerability in Github.com/prometheus/prometheus involving Prometheus Azure AD remote write OAuth client secret exposed via config API under CWE-312: Cleartext Storage of Sensitive Information.
Which Github.com/prometheus/prometheus versions are affected?
Affected versions include releases prior to 0.311.3 across affected packages: github.com/prometheus/prometheus.
What version fixes CVE-2026-42151?
Upgrading to 0.311.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/prometheus/prometheus affected?
Yes, github.com/prometheus/prometheus is affected in releases prior to 0.311.3. Upgrade your dependency to 0.311.3 or later.
What is the CVSS score of CVE-2026-42151?
CVE-2026-42151 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-2026-42151?
CVE-2026-42151 is classified under CWE-312: Cleartext Storage of Sensitive Information (The product stores sensitive information in cleartext within a resource that might be accessible to another control sphere.).
How can I check Go dependencies for CVE-2026-42151?
Run the dependency tree command: 'inspect dependencies for github.com/prometheus/prometheus'. 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-wg65-39gg-5wfj",
  "modified" : "2026-09-09T15:33:43Z",
  "published" : "2026-05-05T19:33:47Z",
  "aliases" : [ "CVE-2026-42151" ],
  "summary" : "Prometheus Azure AD remote write OAuth client secret exposed via config API",
  "details" : "### Impact\n\nUsers who use Azure AD remote write with OAuth authentication are impacted.\n\nThe `client_secret` field in the Azure AD remote write OAuth configuration (`storage/remote/azuread`) was typed as `string` instead of `Secret`. Prometheus redacts fields of type `Secret` when serving the configuration via the `/-/config` HTTP API endpoint. Because the field was a plain string, the Azure OAuth client secret was exposed in plaintext to any user or process with access to that endpoint.\n\n### Patches\n\nThe problem has been patched by changing `ClientSecret` in `OAuthConfig` to `Secret`. Users should upgrade to 3.11.3 or 3.5.3 LTS.\n\n### Workarounds\n\nUsers  who can not upgrade can switch to Managed Identity or Workload Identity authentication for Azure AD remote write, which do not involve a client secret.",
  "severity" : [ {
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  "database_specific" : {
    "cwe_ids" : [ "CWE-200", "CWE-256", "CWE-312" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-05-05T19:33:47Z",
    "nvd_published_at" : "2026-05-04T19:16:04Z"
  }
}