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Advisory record · GHSA-8rvj-mm4h-c258

cert-manager: Direct ACME Challenge resources can bypass Issuer DNS01 solver policy and use ClusterIssuer DNS credentials

CVSS 7.3 HighEPSS 0.0011 · 1st percentile

Published by the GitHub Advisory Database at 29 Oct 2026, 16:39 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
github.com/cert-manager/cert-managerGo>=1.18.0, <1.19.6 || >=1.20.0-alpha.0, <1.20.31.19.6, 1.20.3
Identifiers
GHSA-8rvj-mm4h-c258 · BIT-cert-manager-2026-62290 · CVE-2026-62290 · GO-2026-6889
Weakness (CWE)
CWE-863
Tags
Published
29 Oct 2026
Updated
5 Nov 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Affected: cert-manager versions 1.18.0 up to 1.19.6 and 1.20.0-alpha.0 up to 1.20.3. A namespace user who can create ACME Challenge resources can supply their own DNS01 solver configuration, so cert-manager uses ClusterIssuer DNS credentials outside the Issuer's solver policy. With acme-dns, the attacker-controlled host can receive the referenced account credentials. Upgrade to 1.19.6 or 1.20.3.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.3 High 3.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0011, the 1st percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:11 UTC First seen by agentprime
  2. 31 Oct 2026, 14:11 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.