CVE-2026-4892

high

Description

A heap-based out-of-bounds write vulnerability in the DHCPv6 implementation of dnsmasq allows local attackers to execute arbitrary code with root privileges via a crafted DHCPv6 packet.

References

https://kb.cert.org/vuls/id/471747

https://www.kb.cert.org/vuls/id/471747

https://thekelleys.org.uk/dnsmasq/CVE/

https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html

https://github.com/pi-hole/FTL/releases/tag/v6.6.2

https://github.com/NixOS/nixpkgs/pull/519093

https://github.com/NixOS/nixpkgs/pull/519082

Details

Source: Mitre, NVD

Published: 2026-05-11

Updated: 2026-05-12

Risk Information

CVSS v2

Base Score: 7.2

Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C

Severity: High

CVSS v3

Base Score: 8.4

Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H