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CVE-2026-121505VulnerabilityPublished

NTPsec · Out-of-bounds Read

Affects ntpsecSource GCVE Database

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Authoritative record:CVE-2026-121505· Low 3.7

Not known to be exploited · CVSS 3.7 Low : upgrade to 1.2.4 when convenient.

Data as of 3 Nov 2026, 16:15 UTC

CVSS 3.1 base score
3.7Low
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (GitLab)CVSS 3.13.7
Affects
NTPsec before 1.2.4
Patch
Available – fixed in 1.2.4
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 3 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 3 Nov 2026.

What to do

Upgrade ntpsec/ntpsec to 1.2.4.

Affected software

ProductAffectedFixed in
GitHubntpsec/ntpsecpkg:github/ntpsec/ntpsecOther threatsAffected
  • <1.2.4
Fixed in
  • 1.2.4

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Users should upgrade to NTPsec version 1.2.4 or later where this vulnerability is fixed. No other mitigation or temporary workaround is indicated. Patch status is not explicitly confirmed in the input, but the fixed version is stated as 1.2.4, so upgrading to this version or later resolves the issue.

Description

NTPsec versions before 1.2.4 contain an out-of-bounds read vulnerability in the NTS-KE client response parser. This flaw allows a malicious NTS-KE server to read the client's stack memory, including pointers that can defeat ASLR. The client then sends these pointers in cleartext as NTS cookies, due to an NTS-KE record declaring a length larger than the actual data received.

References

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