Improper Validation of Array Index in cert-manager Operator for Red Hat OpenShift - CVE-2026-25518
Published: November 9, 2026
Vulnerability identifier: #VU162675
CSH Severity: Medium
CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-25518
CWE-ID: CWE-129
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows an unauthenticated remote attacker to cause denial of service of the cert-manager controller.
The vulnerability exists due to improper handling of crafted DNS responses in the controller's DNS cache during ACME DNS-01 processing. An unauthenticated remote attacker can insert a crafted cache entry by intercepting and modifying the controller's unencrypted DNS traffic or controlling the authoritative DNS server for the domain being validated, triggering a panic when the entry is accessed.
Affected software
cert-manager Operator for Red Hat OpenShift
How to mitigate CVE-2026-25518
Install security update from vendor's website.
cert-manager Operator for Red Hat OpenShift - addressed in versions 1.18.5, 1.19.3