UBUNTU-CVE-2026-121505

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    UBUNTU-CVE-2026-121505

    Published: 3 Nov 2026Last Modified: 5 Nov 2026
    Upstream:
    CVE-2026-121505

    Summary:

    Details: 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.

    References: https://ubuntu.com/security/CVE-2026-121505, https://www.cve.org/CVERecord?id=CVE-2026-121505, https://gitlab.com/NTPsec/ntpsec/-/commit/caf0eb5df3c6ddbfc2941389bff0f9146835c021, https://gitlab.com/NTPsec/ntpsec/-/work_items/836, https://gitlab.com/NTPsec/ntpsec/-/work_items/902

    Affected packages

    Package

    Name: ntpsec

    Purl: pkg:deb/ubuntu/ntpsec?arch=source&distro=bionic

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    1.0.0+dfsg1-1
    1.0.0+dfsg1-3

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    UBUNTU-CVE-2026-121505 | CVE-DB