What’s Vulnerable › Vulnerabilities

CVE-2026-102484: Heap-based Buffer Overflow in ntpsec

• Severity: medium (CVSS 6.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-21 · updated 2026-10-29
• Weakness: CWE-122

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

• ntpsec: before 1.2.6 — fixed in 1.2.6

How to fix

Upgrade to a fixed version: ntpsec 1.2.6. Check the vendor advisory for mitigations.

References

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

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