CVE-2026-121505
Low
Description
An out-of-bounds read in the NTS-KE client response parser (nts_client_process_response_core) in NTPsec before 1.2.4 allows a malicious NTS-KE server to read the client's stack memory, including pointers that defeat ASLR, which the client then sends in cleartext as NTS cookies, via an NTS-KE record whose declared length exceeds the data received.
SeverityLow
CVSS3.7
Exploit probability—
ProductNTPsec
PublishedNov 3, 2026
First seenNov 4, 2026
Weakness typeCWE-125Out-of-bounds read
How to fix
Update
- NTPsec NTPsec1.2.4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| NTPsec NTPsec | 1.1.4 ≤ v < 1.2.4 | 1.2.4 |
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