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CVE-2026-4893

CVE-2026-4893

This page contains facts from public vulnerability sources. Check the original advisory before updating.

An information disclosure vulnerability in dnsmasq allows remote attackers to bypass source checks via a crafted DNS packet with RFC 7871 client subnet information.

CVSS 5.3 · Medium · EPSS 0.6% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • dnsmasq

    Versions
    • ≥ 0, < 2.92rel2: Affected (custom)

    Update to 2.92rel2

  • dnsmasq Debian:12

    Versions
    • 2.89-1
    • 2.90-1
    • 2.90-2
    • 2.90-3
    • 2.90-4~deb12u1
    Affected ranges
    • ECOSYSTEM: < 2.90-4~deb12u2

    Update to 2.90-4~deb12u2

  • dnsmasq Debian:13

    Versions
    • 2.91-1
    Affected ranges
    • ECOSYSTEM: < 2.91-1+deb13u1

    Update to 2.91-1+deb13u1

  • dnsmasq Debian:14

    Versions
    • 2.91-1
    • 2.92-1
    • 2.92-1+exp1
    • 2.92-1~exp1
    • 2.92-2
    • 2.92-3
    • 2.92-4
    • 2.92~rc1-1
    • 2.92~rc3-1
    Affected ranges
    • ECOSYSTEM: < 2.92-5

    Update to 2.92-5

  • dnsmasq Ubuntu:Pro:14.04:LTS

    Versions
    • 2.66-4ubuntu1
    • 2.67-1
    • 2.68-1
    • 2.68-1ubuntu0.1
    • 2.68-1ubuntu0.2
    • 2.68-1ubuntu0.2+esm1
    • 2.68-1ubuntu0.2+esm2
    • 2.68-1ubuntu0.2+esm3
    Affected ranges
    • ECOSYSTEM: < 2.68-1ubuntu0.2+esm5

    Update to 2.68-1ubuntu0.2+esm5

  • dnsmasq Ubuntu:Pro:16.04:LTS

    Versions
    • 2.75-1
    • 2.75-1ubuntu0.16.04.1
    • 2.75-1ubuntu0.16.04.2
    • 2.75-1ubuntu0.16.04.3
    • 2.75-1ubuntu0.16.04.4
    • 2.75-1ubuntu0.16.04.5
    • 2.75-1ubuntu0.16.04.7
    • 2.75-1ubuntu0.16.04.8
    • 2.75-1ubuntu0.16.04.10
    • 2.75-1ubuntu0.16.04.10+esm1
    • 2.79-1ubuntu0.16.04.1+esm1
    • 2.79-1ubuntu0.16.04.1+esm2
    • 2.90-0ubuntu0.16.04.1+esm1
    Affected ranges
    • ECOSYSTEM: < 2.90-0ubuntu0.16.04.1+esm3

    Update to 2.90-0ubuntu0.16.04.1+esm3

  • dnsmasq Ubuntu:Pro:18.04:LTS

    Versions
    • 2.78-1
    • 2.78-3
    • 2.79-1
    • 2.79-1ubuntu0.2
    • 2.79-1ubuntu0.3
    • 2.79-1ubuntu0.4
    • 2.79-1ubuntu0.5
    • 2.79-1ubuntu0.6
    • 2.79-1ubuntu0.7
    • 2.90-0ubuntu0.18.04.1+esm1
    Affected ranges
    • ECOSYSTEM: < 2.90-0ubuntu0.18.04.1+esm3

    Update to 2.90-0ubuntu0.18.04.1+esm3

  • dnsmasq Ubuntu:Pro:20.04:LTS

    Versions
    • 2.80-1ubuntu2
    • 2.80-1ubuntu4
    • 2.80-1.1ubuntu1
    • 2.80-1.1ubuntu1.2
    • 2.80-1.1ubuntu1.3
    • 2.80-1.1ubuntu1.4
    • 2.80-1.1ubuntu1.5
    • 2.80-1.1ubuntu1.6
    • 2.80-1.1ubuntu1.7
    • 2.90-0ubuntu0.20.04.1
    Affected ranges
    • ECOSYSTEM: < 2.90-0ubuntu0.20.04.1+esm2

    Update to 2.90-0ubuntu0.20.04.1+esm2

  • dnsmasq Ubuntu:22.04:LTS

    Versions
    • 2.85-1ubuntu2
    • 2.86-1.1
    • 2.86-1.1ubuntu0.1
    • 2.86-1.1ubuntu0.2
    • 2.86-1.1ubuntu0.3
    • 2.86-1.1ubuntu0.4
    • 2.86-1.1ubuntu0.5
    • 2.90-0ubuntu0.22.04.1
    Affected ranges
    • ECOSYSTEM: < 2.90-0ubuntu0.22.04.3

    Update to 2.90-0ubuntu0.22.04.3

  • dnsmasq Ubuntu:24.04:LTS

    Versions
    • 2.89-1
    • 2.90-2
    • 2.90-2build1
    • 2.90-2build2
    • 2.90-2ubuntu0.1
    Affected ranges
    • ECOSYSTEM: < 2.90-2ubuntu0.3

    Update to 2.90-2ubuntu0.3

  • dnsmasq Ubuntu:25.10

    Versions
    • 2.91-1
    • 2.91-1build1
    Affected ranges
    • ECOSYSTEM: < 2.91-1ubuntu0.2

    Update to 2.91-1ubuntu0.2

  • dnsmasq Ubuntu:26.04:LTS

    Versions
    • 2.91-1build1
    • 2.92~rc3-1
    • 2.92-1
    Affected ranges
    • ECOSYSTEM: < 2.92-1ubuntu0.2

    Update to 2.92-1ubuntu0.2

Original sources

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