ALPINE-CVE-2026-42944
- Source
- https://security.alpinelinux.org/vuln/CVE-2026-42944
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2026-42944.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/ALPINE-CVE-2026-42944
- Upstream
- Published
- 2026-05-20T10:16:27.760Z
- Modified
- 2026-06-09T21:31:31.259373926Z
- Severity
-
- 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- [none]
- Details
-
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.
- References