{"id":"CVE-2026-121506","published":"2026-11-03T15:17:37.717","lastModified":"2026-11-03T16:17:24.840","description":"An out-of-bounds read and write in NTS client extension field parsing (extens_client_recv) 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 1.2.4, to bypass NTS authentication and set the client's time, via an NTS Authenticator and Encrypted Extension Fields field whose nonce length exceeds the field.","cvssScore":7.4,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H","cwes":["CWE-787"],"vendors":[],"products":[],"references":[{"url":"https://gitlab.com/NTPsec/ntpsec/-/commit/0a36941e499d533dfbc3fb6b1fcd8c367679d719","tags":[]},{"url":"https://gitlab.com/NTPsec/ntpsec/-/work_items/902","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}