Description
Heap-based buffer overflow in the JJY refclock driver in NTPsec ntpd before 1.2.6 allows an attacker who controls the Telephone JJY time source to corrupt memory or crash ntpd via more than six time replies.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| NTPsec | ntpsec | < 1.2.6 | 1.2.6 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | ntpsec | No fix yet | — |
| Debian 13 | ntpsec | No fix yet | — |
| Debian 12 | ntpsec | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | ntpsec | No fix yet | — |
| Ubuntu 26.04 LTS | ntpsec | No fix yet | — |
| Ubuntu 24.04 LTS | ntpsec | No fix yet | — |
| Ubuntu 22.04 LTS | ntpsec | No fix yet | — |
| Ubuntu 20.04 LTS | ntpsec | No fix yet | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | ntpsec | No fix yet | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | ntpsec | 1.2.6-1.1 | openSUSE-SU-2026:12229-1 |
Advisories 1
- openSUSE-SU-2026:12229-1 libntpc1-1.2.6-1.1 on GA media SUSE / openSUSE Security Updates · Oct 23, 2026