CVE-2026-121506
LOWCVSS 7.4 · HIGHSignal is active with 2 mentions in latest observed window
Immediate actions
- Track advisory updates for patch or workaround availability
Recommended action window: Monitor and triage in normal cycle
NVD 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.
0.0/ 10 priority
Sources & remediation
Other references
Weakness type (CWE)
CWE-787
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
NONE
Momentum
NONE
Threat summary
- 2 mentions across 1 observed day
What's happening
- 2 total mentions across 1 day
Deep dive
Activity timeline2 mentions / 1d
Referenced assets1 URL
By indicator
Full discourse2 posts
- Erica Windisch@birdhax
Pre-auth NTP NTS controlled write to set arbitrary time on clients. https://nvd.nist.gov/vuln/detail/cve-2026-121506
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