CVE-2026-102484 PUBLISHED

Heap-based Buffer Overflow in ntpsec

Assigner: GitLab
Reserved: 29.09.2026 Published: 21.10.2026 Updated: 21.10.2026

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.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H
CVSS Score: 6.4

Attack Vector	Physical	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	Low
Privileges Required	None	Integrity Impact	High
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

Vendor	NTPsec
Product	ntpsec
Versions	Default: unknown affected from 0 to 1.2.6 (excl.)

Solutions

Upgrade to version 1.2.6

Credits

Tristan Madani finder

References

https://gitlab.com/NTPsec/ntpsec/-/work_items/895
https://gitlab.com/NTPsec/ntpsec/-/commit/62a454f6fcb6f2dcc8d5866f6558905ebdb7dd69

Problem Types

CWE-122: Heap-based Buffer Overflow CWE