ntpsec: An out-of-bounds read and write in NTS client extension field parsing (extens_client_recv) in NTPsec before 1.2.5 all...
CVE-2026-121506 is fixed in ntpsec on 1 platform by DEBIAN-CVE-2026-121506 (version 1.2.5+dfsg-1), released November 6, 2026. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| ntpsec · Debian 14 | 1.2.5+dfsg-1 | DEBIAN-CVE-2026-121506 | Nov 6, 2026 |
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