DEBIAN-CVE-2026-42944
- Source
- https://security-tracker.debian.org/tracker/CVE-2026-42944
- Import Source
- https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-42944.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/DEBIAN-CVE-2026-42944
- Upstream
- Published
- 2026-05-20T10:16:27Z
- Modified
- 2026-09-01T16:06:42Z
- 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
Affected packages
Debian:12 / unbound
Package
- Name
- unbound
- Purl
- pkg:deb/debian/unbound?arch=source&distro=bookworm
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0 Unknown introduced version / All previous versions are affected
Debian:13 / unbound
Package
- Name
- unbound
- Purl
- pkg:deb/debian/unbound?arch=source&distro=trixie
Debian:14 / unbound
Package
- Name
- unbound
- Purl
- pkg:deb/debian/unbound?arch=source&distro=forky