PT-2026-39701 · Dnsmasq+3 · Dnsmasq+3

Royce M · Published 2026-05-09 · Updated 2026-06-18 · CVE-2026-4893

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Name of the Vulnerable Software and Affected Versions dnsmasq (affected versions not specified)

Description An information disclosure issue allows remote attackers to bypass source checks by using a crafted DNS packet containing RFC 7871 client subnet information.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Related Identifiers

ALSA-2026:19158

ALSA-2026:19373

ALSA-2026:20589

CVE-2026-4893

OESA-2026-2435

OESA-2026-2436

OESA-2026-2437

OESA-2026-2438

OESA-2026-2509

OPENSUSE-SU-2026:10821-1

RHSA-2026:19158

SUSE-SU-2026:2458-1

USN-8268-1

Affected Products

Linuxmint

Rocky Linux

Ubuntu

Dnsmasq

References · 85

• https://errata.almalinux.org/10/ALSA-2026-19158.html · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-4893 · Vendor Advisory
• https://osv.dev/vulnerability/ALSA-2026:20589 · Vendor Advisory
• https://osv.dev/vulnerability/ALPINE-CVE-2026-4893 · Vendor Advisory
• https://linux.oracle.com/errata/ELSA-2026-20589.html · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:2458-1 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-4893 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-2291 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-4893 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-4892 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-4891 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-8268-1 · Vendor Advisory
• https://osv.dev/vulnerability/ALSA-2026:19158 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-4893 · Vendor Advisory
• https://osv.dev/vulnerability/BELL-CVE-2026-4893 · Vendor Advisory