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.
INFO
Published Date :
2026-02-04T21:18:06.681Z
Last Modified :
2026-02-05T14:31:52.478Z
Source :
GitHub_M
AFFECTED PRODUCTS
The following products are affected by CVE-2026-25518 vulnerability.
| Vendors | Products |
|---|---|
| Cert-manager |
|
REFERENCES
Here, you will find a curated list of external links that provide in-depth information to CVE-2026-25518.
