| Name | CVE-2026-12246 |
| Description | NSD version 4.14.0 introduced a bug where a specially crafted APL RR, with an adflength larger than permitted for the address family will overwrite the stack when the zone is written to disk, with a maximum of 111 attacker controlled bytes. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| nsd (PTS) | bullseye | 4.3.5-1 | fixed |
| bookworm | 4.6.1-1 | fixed |
| trixie | 4.12.0-1 | fixed |
| forky | 4.14.2-1 | vulnerable |
| sid | 4.14.3-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| nsd | source | bullseye | (not affected) | | | |
| nsd | source | bookworm | (not affected) | | | |
| nsd | source | trixie | (not affected) | | | |
| nsd | source | (unstable) | 4.14.3-1 | | | |
Notes
[trixie] - nsd <not-affected> (Vulnerable code introduced later)
[bookworm] - nsd <not-affected> (Vulnerable code introduced later)
[bullseye] - nsd <not-affected> (Vulnerable code introduced later)
https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-12246.txt