CVE-2026-25518
cert-manager-controller DoS via Specially Crafted DNS Response
描述
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.
如何修補 CVE-2026-25518
要修補 CVE-2026-25518,請將受影響套件升級到下列已修補版本。
- —升級至 1.18.5 或更新版本
- —升級至 1.18.5 或更新版本
- —升級至 1.18.5 或更新版本
CVE-2026-25518 正在被利用嗎?
低 — EPSS 為 0.0%,目前沒有觀察到大規模利用活動。
受影響套件(3)
- >= 1.18.0, < 1.18.5, >= 1.19.0, < 1.19.3
- >= 1.18.0, < 1.18.5
- >= 1.18.0, < 1.18.5, >= 1.19.0, < 1.19.3
CVSS 分數
| 來源 | 版本 | 嚴重程度 | 向量 |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |