CVE-2026-18321 · cross-distro fix matrix

CVE-2026-18321: Buffer overflow in NTPsec's Zyfer refclock allows local attacker to crash ntpd

Affects 1 Linux release across 1 (distro × package) combinations. First disclosed: 2026-07-31.

CVSS v3:MEDIUM · 4.7(NVD-published)

Fix per ecosystem

Each block below is a distro release where CVE-2026-18321 has a known fix. Run the listed command on that distro to remediate.

Alpine edge

Source: Alpine secdb

ntpsec→ fixed in1.2.5-r0
```
apk update && apk add --upgrade ntpsec
```

Are YOU affected by CVE-2026-18321?

5-second check on your actual server. Reads /etc/os-release, uname -r, and the distro's package manager; matches against this same cross-source index live.

curl https://mindsparkstack.com/scan.sh | bash

Form-based quickscan View on NVD

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