Denial of Service (DoS) Affecting github.com/cert-manager/cert-manager/pkg/issuer/acme/dns/util package, versions >=1.18.0-alpha.0 <1.18.5>=1.19.0-alpha.0 <1.19.3
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published3 Feb 2026
- disclosed2 Feb 2026
- credit1seal
Introduced: 2 Feb 2026
CVE-2026-25518 (opens in a new tab)How to fix?
Upgrade github.com/cert-manager/cert-manager/pkg/issuer/acme/dns/util to version 1.18.5, 1.19.3 or higher.
Overview
Affected versions of this package are vulnerable to Denial of Service (DoS) via the DNS cache. An attacker can cause the controller to panic and become unavailable by inserting a specially crafted DNS response into the cache, either by intercepting and modifying DNS traffic or by controlling the authoritative DNS server for the validated domain.
Workaround
This vulnerability can be mitigated by configuring DNS-over-HTTPS to reduce the risk of DNS traffic interception and modification.