What’s Vulnerable › Vulnerabilities

CVE-2026-102486: Out-of-bounds Read in ntpsec

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% 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-125

Description

Out-of-bounds read in NTS extension field parsing in NTPsec ntpd 1.1.4 through 1.2.5 allows a remote attacker to crash the daemon via an NTS Authenticator and Encrypted Extension Fields (AEEF) field with an oversized nonce length.

Affected products

• ntpsec: from 1.1.4 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/7cc079387
• https://gitlab.com/NTPsec/ntpsec/-/work_items/891
• https://gitlab.com/NTPsec/ntpsec/-/work_items/895

Get alerted when CVE-2026-102486 or the next vulnerability affects your stack