SB2026110956 - Improper Validation of Array Index in cert-manager Operator for Red Hat OpenShift

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Main Vulnerability Database SB2026110956

SB2026110956 - Improper Validation of Array Index in cert-manager Operator for Red Hat OpenShift

Published: November 9, 2026

Security Bulletin ID SB2026110956
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper Validation of Array Index (CVE-ID: CVE-2026-25518)

CWE-ID: CWE-129 - Improper Validation of Array Index

CVSSv4: 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]


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.


Remediation

Install update from vendor's website.

References