DEBIAN-CVE-2026-121506

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Source
https://security-tracker.debian.org/tracker/CVE-2026-121506
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-121506.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-121506
Upstream
Published
2026-11-03T15:17:37Z
Modified
2026-11-06T16:00:06Z
Severity
  • 7.4 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H CVSS Calculator
Summary
[none]
Details

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.

References

Affected packages

Debian:12 / ntpsec

Package

Name
ntpsec
Purl
pkg:deb/debian/ntpsec?arch=source&distro=bookworm

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.2.2+dfsg1-1
1.2.2+dfsg1-1+deb12u1
1.2.2+dfsg1-2
1.2.2+dfsg1-3
1.2.2+dfsg1-4
1.2.3+dfsg1-1
1.2.3+dfsg1-2
1.2.3+dfsg1-3
1.2.3+dfsg1-4
1.2.3+dfsg1-5
1.2.3+dfsg1-6
1.2.3+dfsg1-7
1.2.3+dfsg1-8
1.2.4+dfsg-1
1.2.5+dfsg-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-121506.json"

Debian:13 / ntpsec

Package

Name
ntpsec
Purl
pkg:deb/debian/ntpsec?arch=source&distro=trixie

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.2.3+dfsg1-8
1.2.4+dfsg-1
1.2.5+dfsg-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-121506.json"

Debian:14 / ntpsec

Package

Name
ntpsec
Purl
pkg:deb/debian/ntpsec?arch=source&distro=forky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.2.5+dfsg-1

Affected versions

1.*
1.2.3+dfsg1-8
1.2.4+dfsg-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-121506.json"