| Name | CVE-2026-18321 |
| Description | Buffer overflow in NTPsec's Zyfer refclock allows local attacker to crash ntpd |
| 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 |
|---|
| ntpsec (PTS) | bullseye | 1.2.0+dfsg1-4 | vulnerable |
| bookworm, bookworm (security) | 1.2.2+dfsg1-1+deb12u1 | vulnerable |
| trixie | 1.2.3+dfsg1-8 | vulnerable |
| forky, sid | 1.2.4+dfsg-1 | vulnerable |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| ntpsec | source | (unstable) | (unfixed) | | | |
Notes
https://gitlab.com/NTPsec/ntpsec/-/work_items/890
check details, upstream work item not public at 2026-07-31