{"cve":"CVE-2026-25518","nvd":{"published":"2026-02-04T22:15:58.990","modified":"2026-06-17T10:24:46.760","status":"Analyzed","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","score":5.9},"cwes":["CWE-129","CWE-704"],"references":["https://github.com/cert-manager/cert-manager/commit/409fc24e539711a07aae45ed45abbe03dfdad2cc","https://github.com/cert-manager/cert-manager/commit/9a73a0b3853035827edd37ac463e4803ba10327d","https://github.com/cert-manager/cert-manager/commit/d4faed26ae12115cceb807cdc12507ebc28980e2","https://github.com/cert-manager/cert-manager/pull/8467","https://github.com/cert-manager/cert-manager/pull/8468"],"products":["cert-manager:cert-manager"],"source":"nvd","synced_at":"2026-10-19T22:22:27.261130201+00:00"},"epss":{"cve":"CVE-2026-25518","score":0.00375,"percentile":0.31495,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-gx3x-vq4p-mhhv","url":"https://osv.dev/vulnerability/GHSA-gx3x-vq4p-mhhv","summary":"cert-manager-controller DoS via Specially Crafted DNS Response","modified":"2026-09-10T03:50:35.167059566Z","packages":[{"ecosystem":"Go","name":"github.com/cert-manager/cert-manager","purl":"pkg:golang/github.com/cert-manager/cert-manager","ranges":[">=1.18.0 <1.18.5"],"fixed":["1.18.5"]},{"ecosystem":"Go","name":"github.com/cert-manager/cert-manager","purl":"pkg:golang/github.com/cert-manager/cert-manager","ranges":[">=1.19.0 <1.19.3"],"fixed":["1.19.3"]}]},{"id":"GO-2026-4399","url":"https://osv.dev/vulnerability/GO-2026-4399","summary":"DoS in cert-manager-controller via Specially Crafted DNS Response in github.com/cert-manager/cert-manager","modified":"2026-03-16T14:55:08.066990Z","packages":[{"ecosystem":"Go","name":"github.com/cert-manager/cert-manager","purl":"pkg:golang/github.com/cert-manager/cert-manager","ranges":[">=1.18.0 <1.18.5",">=1.19.0 <1.19.3"],"fixed":["1.18.5","1.19.3"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}