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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-25518 Detail

Description

cert-manager adds certificates and certificate issuers as resource types in Kubernetes clusters, and simplifies the process of obtaining, renewing and using those certificates. In versions from 1.18.0 to before 1.18.5 and from 1.19.0 to before 1.19.3, the cert-manager-controller performs DNS lookups during ACME DNS-01 processing (for zone discovery and propagation self-checks). By default, these lookups use standard unencrypted DNS. An attacker who can intercept and modify DNS traffic from the cert-manager-controller pod can insert a crafted entry into cert-manager's DNS cache. Accessing this entry will trigger a panic, resulting in denial‑of‑service (DoS) of the cert-manager controller. The issue can also be exploited if the authoritative DNS server for the domain being validated is controlled by a malicious actor. This issue has been patched in versions 1.18.5 and 1.19.3.


Metrics

 
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CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://github.com/cert-manager/cert-manager/commit/409fc24e539711a07aae45ed45abbe03dfdad2cc GitHub, Inc. Patch 
https://github.com/cert-manager/cert-manager/commit/9a73a0b3853035827edd37ac463e4803ba10327d GitHub, Inc. Patch 
https://github.com/cert-manager/cert-manager/commit/d4faed26ae12115cceb807cdc12507ebc28980e2 GitHub, Inc. Patch 
https://github.com/cert-manager/cert-manager/pull/8467 GitHub, Inc. Issue Tracking  Patch 
https://github.com/cert-manager/cert-manager/pull/8468 GitHub, Inc. Issue Tracking  Patch 
https://github.com/cert-manager/cert-manager/pull/8469 GitHub, Inc. Issue Tracking  Patch 
https://github.com/cert-manager/cert-manager/security/advisories/GHSA-gx3x-vq4p-mhhv GitHub, Inc. Mitigation  Patch  Vendor Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-129 Improper Validation of Array Index GitHub, Inc.  
CWE-704 Incorrect Type Conversion or Cast GitHub, Inc.  

Known Affected Software Configurations Switch to CPE 2.2

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Change History

4 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-25518
NVD Published Date:
02/04/2026
NVD Last Modified:
06/17/2026
Source:
GitHub, Inc.