CVE-2026-42944
CVE-2026-42944 · Heap overflow with multiple NSID, COOKIE, PADDING EDNS options
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NLnet Labs Unbound 1.14.0 up to and including version 1.25.0 has a vulnerability that results in heap overflow when encoding multiple NSID and/or DNS Cookie EDNS and/or EDNS Padding options in the reply packet. The relevant options ('nsid', 'answer-cookie', 'pad-responses' (default)) need to be enabled for the vulnerability to be exploited. An adversary who can query Unbound can exploit the vulnerability by attaching multiple NSID and/or DNS Cookie EDNS and/or EDNS Padding options to the query. A flaw in the size calculation of the EDNS field truncates the correct value which allows the encoder to overflow the available space when writing. Those two combined lead to a heap overflow write of Unbound controlled data and eventually a crash. Unbound 1.25.1 contains a patch with a fix to de-duplicate the EDNS options and a fix to prevent truncation of the EDNS field size calculation.
CVSS 8.7 · Hoch · EPSS 0,8% · Korrektur verfügbar
- Veröffentlicht
- Aktualisiert
Technologie-Stack: system
Betroffene Produkte und Versionen
unbound
- Softwareversionen
- ≥ 1.14.0, < 1.25.1: Betroffen (semver)
Auf 1.25.1 aktualisieren
unbound Debian:12
- Softwareversionen
- 1.17.1-2
- 1.17.1-2+deb12u1
- 1.17.1-2+deb12u2
- 1.17.1-2+deb12u3
- 1.17.1-2+deb12u4
- 1.17.1-2+loong64
- 1.18.0-1
- 1.18.0-2
- 1.19.1-1
- 1.19.2-1
- 1.20.0-1
- 1.21.1-1
- 1.22.0-1
- 1.22.0-2
- 1.23.1-1
- 1.24.0-1
- 1.24.0-2
- 1.24.1-1
- 1.24.1-2
- 1.24.2-1
- 1.25.0-1
- 1.25.1-1
- 1.25.2-1
- 1.26.0-1
- 1.26.0-2
- 1.26.1-1
- Betroffene Versionsbereiche
- ECOSYSTEM: (−∞, +∞)
Keine Korrektur veröffentlicht
unbound Debian:13
- Softwareversionen
- 1.22.0-2
- 1.22.0-2+deb13u1
- 1.22.0-2+deb13u2
- Betroffene Versionsbereiche
- ECOSYSTEM: < 1.22.0-2+deb13u3
Auf 1.22.0-2+deb13u3 aktualisieren
unbound Debian:14
- Softwareversionen
- 1.22.0-2
- 1.23.1-1
- 1.24.0-1
- 1.24.0-2
- 1.24.1-1
- 1.24.1-2
- 1.24.2-1
- 1.25.0-1
- Betroffene Versionsbereiche
- ECOSYSTEM: < 1.25.1-1
Auf 1.25.1-1 aktualisieren
unbound Ubuntu:24.04:LTS
- Softwareversionen
- 1.17.1-2
- 1.18.0-2ubuntu1
- 1.18.0-2ubuntu2
- 1.19.1-1ubuntu1
- 1.19.2-1ubuntu1
- 1.19.2-1ubuntu3
- 1.19.2-1ubuntu3.1
- 1.19.2-1ubuntu3.2
- 1.19.2-1ubuntu3.3
- 1.19.2-1ubuntu3.4
- 1.19.2-1ubuntu3.5
- 1.19.2-1ubuntu3.6
- 1.19.2-1ubuntu3.7
- Betroffene Versionsbereiche
- ECOSYSTEM: < 1.19.2-1ubuntu3.8
Auf 1.19.2-1ubuntu3.8 aktualisieren
unbound Ubuntu:25.10
- Softwareversionen
- 1.22.0-1ubuntu1
- 1.22.0-2ubuntu1
- 1.22.0-2ubuntu2
- 1.22.0-2ubuntu2.1
- 1.22.0-2ubuntu2.2
- Betroffene Versionsbereiche
- ECOSYSTEM: < 1.22.0-2ubuntu2.3
Auf 1.22.0-2ubuntu2.3 aktualisieren
unbound Ubuntu:26.04:LTS
- Softwareversionen
- 1.22.0-2ubuntu2
- 1.22.0-2ubuntu4
- 1.24.2-1ubuntu1
- 1.24.2-1ubuntu2
- Betroffene Versionsbereiche
- ECOSYSTEM: < 1.24.2-1ubuntu2.1
Auf 1.24.2-1ubuntu2.1 aktualisieren
Originalquellen
- https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-42944.txt
- https://access.redhat.com/security/cve/CVE-2026-42944
- https://bugzilla.redhat.com/show_bug.cgi?id=2479774
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42944.json
- https://access.redhat.com/errata/RHSA-2026:23231
- https://access.redhat.com/errata/RHSA-2026:24365
- https://access.redhat.com/errata/RHSA-2026:24369
- https://access.redhat.com/errata/RHSA-2026:19752
- https://nvd.nist.gov/vuln/detail/CVE-2026-42944