CVE-2026-4891CWE-125

CVE-2026-4891

Medium · published May 11, 2026

CVSS v3.1
5.3
EPSS
1%
Percentile
57.3
In the wild
Unconfirmed
What it is

A heap-based out-of-bounds read vulnerability in the DNSSEC validation of dnsmasq allows remote attackers to cause a denial of service via a crafted DNS packet.

The record
Technical detail
CVSS v3.1
5.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00836 · 57.3th percentile
Weakness
CWE-125 · Out-of-bounds Read
Published
2026-05-11T22:16Z
References (14)
https://github.com/NixOS/nixpkgs/pull/519082 · [email protected]https://github.com/NixOS/nixpkgs/pull/519093 · [email protected]https://github.com/pi-hole/FTL/releases/tag/v6.6.2 · [email protected]https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html · [email protected]https://thekelleys.org.uk/dnsmasq/CVE/ · [email protected]https://www.kb.cert.org/vuls/id/471747 · [email protected]https://access.redhat.com/errata/RHSA-2026:19158 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:19373 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:20589 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:34508 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:40762 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/security/cve/CVE-2026-4891 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://bugzilla.redhat.com/show_bug.cgi?id=2458517 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4891.json · 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
EPSS history
Timeline
  • 11 MAY 16:47Z
    CVE-2026-4891
    cvelistv5