ALPINE-CVE-2026-42944
ALPINE-CVE-2026-42944
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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 7.5 · Hoch · Korrektur verfügbar
- Veröffentlicht
- Aktualisiert
Technologie-Stack: system
Betroffene Produkte und Versionen
unbound Alpine:v3.22
- Betroffene Versionsbereiche
- ECOSYSTEM: ≥ 1.14.0, < 1.25.2-r0
Auf 1.25.2-r0 aktualisieren
unbound Alpine:v3.23
- Betroffene Versionsbereiche
- ECOSYSTEM: ≥ 1.14.0, < 1.25.2-r0
Auf 1.25.2-r0 aktualisieren
unbound Alpine:v3.24
- Betroffene Versionsbereiche
- ECOSYSTEM: ≥ 1.14.0, < 1.25.1-r0
Auf 1.25.1-r0 aktualisieren