CVE-2026-82717

Katalog CVE

CVSS 9.8 · Critical EPSS 0,78%

Kerentanan Heap-based Buffer Overflow pada nlnetlabs unbound. Skor CVSS 3.1 9.8 (Critical) menurut NVD.

Deskripsi (NVD)

In NLnet Labs Unbound up to and including 1.26.0, a vulnerability was found in that can progressively corrupt heap memory and under certain systems and compilation options could lead to remote code execution. The vulnerability starts when CNAME synthesis during an upstream response needs to enforce(rewrite) a max TTL value in the packet buffer. Coupled with a compression pointer that points to the overwritten value and invalidates the domain name, it leads to an error path that does not properly move the buffer position and allows for the heap buffer overflow. Since this is heavily reliant on heap memory layout, results are memory corruption that eventually leads to a crash and under specific systems and compilation options remote code execution.

Rincian

Terbit di NVD

16 September 2026

Terakhir diubah

23 September 2026

Status NVD

Analyzed

CVSS 3.1

9.8 (Critical), sumber NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-122: Heap-based Buffer Overflow

EPSS (30 hari)

0,78% peluang dieksploitasi; lebih tinggi dari 54,8% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-82717.txt patch · advisory vendor