CVE catalog

CVE-2026-2291

dnsmasqs extract_name() function can be abused to cause a heap buffer overflow, allowing an attacker to inject false DNS cache entries, which could result in DNS lookups to redirect to an attacker-con

[CVE catalog]

Severity
High · CVSS 8.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
Source
[NVD] · [CVE record]
EPSS
0.61% · Oct 25, 2026

dnsmasqs extract_name() function can be abused to cause a heap buffer overflow, allowing an attacker to inject false DNS cache entries, which could result in DNS lookups to redirect to an attacker-controlled IP address, or to cause a DoS.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

DistributionPackageReleaseVersionStatus
Debiandnsmasqsid2.93-3fixed
Debiandnsmasqforky2.93-3fixed
Debiandnsmasqtrixie2.91-1+deb13u2fixed
Debiandnsmasqtrixie-security2.91-1+deb13u1fixed
Debiandnsmasqbookworm2.90-4~deb12u2fixed
Debiandnsmasqbookworm-security2.90-4~deb12u2fixed
CpednsmasqNot reported2.90-2ubuntu0.3fixed
Cpednsmasq-baseNot reported2.90-2ubuntu0.3fixed
Cpednsmasq-base-luaNot reported2.90-2ubuntu0.3fixed
Cpednsmasq-utilsNot reported2.90-2ubuntu0.3fixed
CpednsmasqNot reported2.90-4~deb12u2fixed
Alpinednsmasq3.222.91-r1fixed
Alpinednsmasq3.232.91-r1fixed
Alpinednsmasq3.242.92_p2-r0fixed
Ubuntudnsmasqpro2.80-1ubuntu2vulnerable
Ubuntudnsmasqpro2.80-1ubuntu4vulnerable
Ubuntudnsmasqpro2.80-1.1ubuntu1vulnerable
Ubuntudnsmasqpro2.80-1.1ubuntu1.2vulnerable
Ubuntudnsmasqpro2.80-1.1ubuntu1.3vulnerable
Ubuntudnsmasqpro2.80-1.1ubuntu1.4vulnerable
Ubuntudnsmasqpro2.80-1.1ubuntu1.5vulnerable
Ubuntudnsmasqpro2.80-1.1ubuntu1.6vulnerable
Ubuntudnsmasqpro2.80-1.1ubuntu1.7vulnerable
Ubuntudnsmasqpro2.90-0ubuntu0.20.04.1vulnerable
Ubuntudnsmasqpro2.90-0ubuntu0.20.04.1+esm2fixed
Ubuntudnsmasq22.042.85-1ubuntu2vulnerable
Ubuntudnsmasq22.042.86-1.1vulnerable
Ubuntudnsmasq22.042.86-1.1ubuntu0.1vulnerable
Ubuntudnsmasq22.042.86-1.1ubuntu0.2vulnerable
Ubuntudnsmasq22.042.86-1.1ubuntu0.3vulnerable
Ubuntudnsmasq22.042.86-1.1ubuntu0.4vulnerable
Ubuntudnsmasq22.042.86-1.1ubuntu0.5vulnerable
Ubuntudnsmasq22.042.90-0ubuntu0.22.04.1vulnerable
Ubuntudnsmasq22.042.90-0ubuntu0.22.04.3fixed
Ubuntudnsmasq24.042.89-1vulnerable
Ubuntudnsmasq24.042.90-2vulnerable
Ubuntudnsmasq24.042.90-2build1vulnerable
Ubuntudnsmasq24.042.90-2build2vulnerable
Ubuntudnsmasq24.042.90-2ubuntu0.1vulnerable
Ubuntudnsmasq24.042.90-2ubuntu0.3fixed
Ubuntudnsmasq25.102.91-1vulnerable
Ubuntudnsmasq25.102.91-1build1vulnerable
Ubuntudnsmasq25.102.91-1ubuntu0.2fixed
Ubuntudnsmasq26.042.91-1build1vulnerable
Ubuntudnsmasq26.042.92~rc3-1vulnerable
Ubuntudnsmasq26.042.92-1vulnerable
Ubuntudnsmasq26.042.92-1ubuntu0.2fixed
Susednsmasqlinux enterprise server 12 sp5-ltss2.92rel2-18.27.1fixed
Susednsmasqlinux enterprise server ltss extended security 12 sp52.92rel2-18.27.1fixed
Opensusednsmasqtumbleweed2.92rel2-1.1fixed
Ubuntudnsmasqpro2.80-1ubuntu2vulnerable
Ubuntudnsmasqpro2.80-1ubuntu4vulnerable
Ubuntudnsmasqpro2.80-1.1ubuntu1vulnerable
Ubuntudnsmasqpro2.80-1.1ubuntu1.2vulnerable
Ubuntudnsmasqpro2.80-1.1ubuntu1.3vulnerable
Ubuntudnsmasqpro2.80-1.1ubuntu1.4vulnerable
Ubuntudnsmasqpro2.80-1.1ubuntu1.5vulnerable
Ubuntudnsmasqpro2.80-1.1ubuntu1.6vulnerable
Ubuntudnsmasqpro2.80-1.1ubuntu1.7vulnerable
Ubuntudnsmasqpro2.90-0ubuntu0.20.04.1vulnerable
Ubuntudnsmasqpro2.90-0ubuntu0.20.04.1+esm2fixed
Ubuntudnsmasq22.042.85-1ubuntu2vulnerable
Ubuntudnsmasq22.042.86-1.1vulnerable
Ubuntudnsmasq22.042.86-1.1ubuntu0.1vulnerable
Ubuntudnsmasq22.042.86-1.1ubuntu0.2vulnerable
Ubuntudnsmasq22.042.86-1.1ubuntu0.3vulnerable
Ubuntudnsmasq22.042.86-1.1ubuntu0.4vulnerable
Ubuntudnsmasq22.042.86-1.1ubuntu0.5vulnerable
Ubuntudnsmasq22.042.90-0ubuntu0.22.04.1vulnerable
Ubuntudnsmasq22.042.90-0ubuntu0.22.04.3fixed
Ubuntudnsmasq24.042.89-1vulnerable
Ubuntudnsmasq24.042.90-2vulnerable
Ubuntudnsmasq24.042.90-2build1vulnerable
Ubuntudnsmasq24.042.90-2build2vulnerable
Ubuntudnsmasq24.042.90-2ubuntu0.1vulnerable
Ubuntudnsmasq24.042.90-2ubuntu0.3fixed
Ubuntudnsmasq25.102.91-1vulnerable
Ubuntudnsmasq25.102.91-1build1vulnerable
Ubuntudnsmasq25.102.91-1ubuntu0.2fixed
Ubuntudnsmasq26.042.91-1build1vulnerable
Ubuntudnsmasq26.042.92~rc3-1vulnerable
Ubuntudnsmasq26.042.92-1vulnerable
Ubuntudnsmasq26.042.92-1ubuntu0.2fixed

Fixed-version evidence

DistributionPackageTypeReleaseFixed versionUrgencyOriginBugs
Debiandnsmasqsourcesid2.92-5not yet assignedNot reportedNot reported
Debiandnsmasqsourceforky2.92-5not yet assignedNot reportedNot reported
Debiandnsmasqsourcetrixie2.91-1+deb13u1not yet assignedNot reportedNot reported
Debiandnsmasqsourcebookworm2.90-4~deb12u2not yet assignedNot reportedNot reported
CpednsmasqcpeNot reported2.90-2ubuntu0.3Not reportedNot reportedNot reported
Cpednsmasq-basecpeNot reported2.90-2ubuntu0.3Not reportedNot reportedNot reported
Cpednsmasq-base-luacpeNot reported2.90-2ubuntu0.3Not reportedNot reportedNot reported
Cpednsmasq-utilscpeNot reported2.90-2ubuntu0.3Not reportedNot reportedNot reported
CpednsmasqcpeNot reported2.90-4~deb12u2Not reportedNot reportedNot reported
Alpinednsmasqapk3.222.91-r1Not reportedALPINE-CVE-2026-2291Not reported
Alpinednsmasqapk3.232.91-r1Not reportedALPINE-CVE-2026-2291Not reported
Alpinednsmasqapk3.242.92_p2-r0Not reportedALPINE-CVE-2026-2291Not reported
Ubuntudnsmasqdebpro2.90-0ubuntu0.20.04.1+esm2Not reportedUSN-8268-1Not reported
Ubuntudnsmasqdeb22.042.90-0ubuntu0.22.04.3Not reportedUSN-8268-1Not reported
Ubuntudnsmasqdeb24.042.90-2ubuntu0.3Not reportedUSN-8268-1Not reported
Ubuntudnsmasqdeb25.102.91-1ubuntu0.2Not reportedUSN-8268-1Not reported
Ubuntudnsmasqdeb26.042.92-1ubuntu0.2Not reportedUSN-8268-1Not reported
Susednsmasqrpmlinux enterprise server 12 sp5-ltss2.92rel2-18.27.1Not reportedSUSE-SU-2026:2458-1Not reported
Susednsmasqrpmlinux enterprise server ltss extended security 12 sp52.92rel2-18.27.1Not reportedSUSE-SU-2026:2458-1Not reported
Opensusednsmasqrpmtumbleweed2.92rel2-1.1Not reportedOPENSUSE-SU-2026:10821-1Not reported
Ubuntudnsmasqdebpro2.90-0ubuntu0.20.04.1+esm2Not reportedUBUNTU-CVE-2026-2291Not reported
Ubuntudnsmasqdeb22.042.90-0ubuntu0.22.04.3Not reportedUBUNTU-CVE-2026-2291Not reported
Ubuntudnsmasqdeb24.042.90-2ubuntu0.3Not reportedUBUNTU-CVE-2026-2291Not reported
Ubuntudnsmasqdeb25.102.91-1ubuntu0.2Not reportedUBUNTU-CVE-2026-2291Not reported
Ubuntudnsmasqdeb26.042.92-1ubuntu0.2Not reportedUBUNTU-CVE-2026-2291Not reported

OpenFactory catalog packages

[openSUSE Tumbleweed]

  • [dnsmasq-utils]Unknown

    Source package: [dnsmasq]

    Details (1)

    • 2.93-2.3 · x86_64 · tumbleweed

      Unknown · Fixed: 2.92rel2-1.1

      Version impact unknown

      nvd · dnsmasq · opensuse · tumbleweed

  • [dnsmasq]Fixed

    Source package: [dnsmasq]

    Details (1)

    • 2.93-2.3 · x86_64 · tumbleweed

      Fixed · Fixed: 2.92rel2-1.1

      nvd · dnsmasq · opensuse · tumbleweed

[Debian 12 (Bookworm)]

  • [dnsmasq]Fixed
    Details (4)

    • 2.90-4~deb12u2 · all · bookworm

      Fixed · Fixed: 2.90-4~deb12u2

      nvd · dnsmasq · debian · bookworm; nvd · dnsmasq · debian · 12

    • 2.90-4~deb12u2 · all · bookworm

      Fixed · Fixed: 2.90-4~deb12u2

      nvd · dnsmasq · debian · bookworm; nvd · dnsmasq · debian · 12

    • 2.90-4~deb12u2 · all · bookworm-security

      Fixed · Fixed: 2.90-4~deb12u2

      nvd · dnsmasq · debian · bookworm; nvd · dnsmasq · debian · 12

    • 2.90-4~deb12u2 · all · bookworm-security

      Fixed · Fixed: 2.90-4~deb12u2

      nvd · dnsmasq · debian · bookworm; nvd · dnsmasq · debian · 12

  • [dnsmasq-base]Fixed

    Source package: [dnsmasq]

    Details (4)

    • 2.90-4~deb12u2 · amd64 · bookworm

      Fixed · Fixed: 2.90-4~deb12u2

      nvd · dnsmasq · debian · bookworm; nvd · dnsmasq · debian · 12

    • 2.90-4~deb12u2 · arm64 · bookworm

      Fixed · Fixed: 2.90-4~deb12u2

      nvd · dnsmasq · debian · bookworm; nvd · dnsmasq · debian · 12

    • 2.90-4~deb12u2 · amd64 · bookworm-security

      Fixed · Fixed: 2.90-4~deb12u2

      nvd · dnsmasq · debian · bookworm; nvd · dnsmasq · debian · 12

    • 2.90-4~deb12u2 · arm64 · bookworm-security

      Fixed · Fixed: 2.90-4~deb12u2

      nvd · dnsmasq · debian · bookworm; nvd · dnsmasq · debian · 12

  • [dnsmasq-base-lua]Fixed

    Source package: [dnsmasq]

    Details (4)

    • 2.90-4~deb12u2 · amd64 · bookworm

      Fixed · Fixed: 2.90-4~deb12u2

      nvd · dnsmasq · debian · bookworm; nvd · dnsmasq · debian · 12

    • 2.90-4~deb12u2 · arm64 · bookworm

      Fixed · Fixed: 2.90-4~deb12u2

      nvd · dnsmasq · debian · bookworm; nvd · dnsmasq · debian · 12

    • 2.90-4~deb12u2 · amd64 · bookworm-security

      Fixed · Fixed: 2.90-4~deb12u2

      nvd · dnsmasq · debian · bookworm; nvd · dnsmasq · debian · 12

    • 2.90-4~deb12u2 · arm64 · bookworm-security

      Fixed · Fixed: 2.90-4~deb12u2

      nvd · dnsmasq · debian · bookworm; nvd · dnsmasq · debian · 12

  • [dnsmasq-utils]Fixed

    Source package: [dnsmasq]

    Details (4)

    • 2.90-4~deb12u2 · amd64 · bookworm

      Fixed · Fixed: 2.90-4~deb12u2

      nvd · dnsmasq · debian · bookworm; nvd · dnsmasq · debian · 12

    • 2.90-4~deb12u2 · arm64 · bookworm

      Fixed · Fixed: 2.90-4~deb12u2

      nvd · dnsmasq · debian · bookworm; nvd · dnsmasq · debian · 12

    • 2.90-4~deb12u2 · amd64 · bookworm-security

      Fixed · Fixed: 2.90-4~deb12u2

      nvd · dnsmasq · debian · bookworm; nvd · dnsmasq · debian · 12

    • 2.90-4~deb12u2 · arm64 · bookworm-security

      Fixed · Fixed: 2.90-4~deb12u2

      nvd · dnsmasq · debian · bookworm; nvd · dnsmasq · debian · 12

[Debian 13 (Trixie)]

  • [dnsmasq]Fixed
    Details (4)

    • 2.91-1+deb13u1 · all · trixie

      Fixed · Fixed: 2.91-1+deb13u1

      nvd · dnsmasq · debian · 13

    • 2.91-1+deb13u1 · all · trixie

      Fixed · Fixed: 2.91-1+deb13u1

      nvd · dnsmasq · debian · 13

    • 2.91-1+deb13u1 · all · trixie-security

      Fixed · Fixed: 2.91-1+deb13u1

      nvd · dnsmasq · debian · 13

    • 2.91-1+deb13u1 · all · trixie-security

      Fixed · Fixed: 2.91-1+deb13u1

      nvd · dnsmasq · debian · 13

  • [dnsmasq-base]Fixed

    Source package: [dnsmasq]

    Details (4)

    • 2.91-1+deb13u1 · amd64 · trixie

      Fixed · Fixed: 2.91-1+deb13u1

      nvd · dnsmasq · debian · 13

    • 2.91-1+deb13u1 · arm64 · trixie

      Fixed · Fixed: 2.91-1+deb13u1

      nvd · dnsmasq · debian · 13

    • 2.91-1+deb13u1 · amd64 · trixie-security

      Fixed · Fixed: 2.91-1+deb13u1

      nvd · dnsmasq · debian · 13

    • 2.91-1+deb13u1 · arm64 · trixie-security

      Fixed · Fixed: 2.91-1+deb13u1

      nvd · dnsmasq · debian · 13

  • [dnsmasq-base-lua]Fixed

    Source package: [dnsmasq]

    Details (4)

    • 2.91-1+deb13u1 · amd64 · trixie

      Fixed · Fixed: 2.91-1+deb13u1

      nvd · dnsmasq · debian · 13

    • 2.91-1+deb13u1 · arm64 · trixie

      Fixed · Fixed: 2.91-1+deb13u1

      nvd · dnsmasq · debian · 13

    • 2.91-1+deb13u1 · amd64 · trixie-security

      Fixed · Fixed: 2.91-1+deb13u1

      nvd · dnsmasq · debian · 13

    • 2.91-1+deb13u1 · arm64 · trixie-security

      Fixed · Fixed: 2.91-1+deb13u1

      nvd · dnsmasq · debian · 13

  • [dnsmasq-utils]Fixed

    Source package: [dnsmasq]

    Details (4)

    • 2.91-1+deb13u1 · amd64 · trixie

      Fixed · Fixed: 2.91-1+deb13u1

      nvd · dnsmasq · debian · 13

    • 2.91-1+deb13u1 · arm64 · trixie

      Fixed · Fixed: 2.91-1+deb13u1

      nvd · dnsmasq · debian · 13

    • 2.91-1+deb13u1 · amd64 · trixie-security

      Fixed · Fixed: 2.91-1+deb13u1

      nvd · dnsmasq · debian · 13

    • 2.91-1+deb13u1 · arm64 · trixie-security

      Fixed · Fixed: 2.91-1+deb13u1

      nvd · dnsmasq · debian · 13

Observed:

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]