CVE-2026-121505

    Dashboard / Vulnerabilities / CVE-2026-121505

    CVE-2026-121505

    Published: 3 Nov 2026Last Modified: 5 Nov 2026

    Summary: Out-of-bounds Read in NTPsec

    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://gitlab.com/NTPsec/ntpsec/-/work_items/836, https://gitlab.com/NTPsec/ntpsec/-/work_items/902, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/121xxx/CVE-2026-121505.json, https://nvd.nist.gov/vuln/detail/CVE-2026-121505, https://gitlab.com/NTPsec/ntpsec/-/commit/caf0eb5df3c6ddbfc2941389bff0f9146835c021, https://gitlab.com/NTPsec/ntpsec

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 79cd18fc56fc902c3a7fd78bcc32ee72f52eb396
    Fixed -a9e66af44c0be47e8e32a972b3f3fb7cea65f808

    Affected versions

    NTPsec_1_2_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
    CVE-2026-121505 | CVE-DB