CVE-2026-121506 Out-of-bounds Write in NTPsec

An out-of-bounds read and write in NTS client extension field parsing extensclientrecv in NTPsec before 1.2.5 allows a remote attacker who can send NTP server-mode replies to an NTS client to corrupt heap memory and crash ntpd, and, combined with the NTS-KE client out-of-bounds read fixed in 1.2....

CVE-2026-121506

The NTPsec software (versions before 1.2.5 ) is vulnerable to an out-of-bounds read and write during NTS client extension field parsing within the extens_client_recv function. A remote attacker capable of sending NTP server-mode replies to an NTS client can exploit this to corrupt heap memory and...