CVE-2025-66491: traefik

csirt@kutim:~/threat-intel/cve/CVE-2025-66491

CVSS 5.9 · Medium EPSS 0,22%

Kerentanan Improper Certificate Validation pada traefik. Skor CVSS 3.1 5.9 (Medium) menurut github.com.

Deskripsi (NVD)

Traefik is an HTTP reverse proxy and load balancer. Versions 3.5.0 through 3.6.2 have inverted TLS verification logic in the nginx.ingress.kubernetes.io/proxy-ssl-verify annotation. Setting the annotation to "on" (intending to enable backend TLS certificate verification) actually disables verification, allowing man-in-the-middle attacks against HTTPS backends when operators believe they are protected. This issue is fixed in version 3.6.3.

Rincian

Terbit di NVD: 9 Desember 2025
Terakhir diubah: 17 Juni 2026
Status NVD: Analyzed
CVSS 3.1: 5.9 (Medium), sumber github.com
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N · uraikan di kalkulator
Jenis kelemahan (CWE): CWE-295: Improper Certificate Validation
EPSS (30 hari): 0,22% peluang dieksploitasi; lebih tinggi dari 11,6% CVE lain

Produk dan versi terdampak

Vendor	Produk	Versi terdampak
traefik	traefik	Versi 3.5.0 hingga sebelum 3.6.3

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

https://github.com/traefik/traefik/security/advisories/GHSA-7vww-mvcr-x6vj patch · advisory vendor
https://github.com/traefik/traefik/commit/14a1aedf5704673d875d210d7bacf103a43c77e4 patch
https://github.com/traefik/traefik/releases/tag/v3.6.3 release notes

Sumber: NVD · CVE.org · EPSS. Halaman ini disusun otomatis dari data tersebut; pembaruan terakhir 5 Okt 2026, 20:11 WITA. Kalau sistem di Perangkat Daerah memakai produk ini dan butuh bantuan, laporkan lewat kanal pelaporan.