CVE-2026-116566

    Dashboard / Vulnerabilities / CVE-2026-116566

    CVE-2026-116566

    Published: 29 Oct 2026Last Modified: 10 Nov 2026
    Aliases:
    PSF-2026-48

    Summary: socket.getaddrinfo() accepts embedded null bytes in host and port

    Details: socket.getaddrinfo() previously accepted null bytes within *host* and *port* parameters which can cause the values to be silently truncated.

    References: http://www.openwall.com/lists/oss-security/2026/10/29/4, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/116xxx/CVE-2026-116566.json, https://mail.python.org/archives/list/[email protected]/thread/HCHE62VYTPYI6WOPJQDWUBR4CINBPSM7/, https://nvd.nist.gov/vuln/detail/CVE-2026-116566, https://github.com/python/cpython/issues/160898, https://github.com/python/cpython/commit/131a3a66c5f400b588f9fd2732a5ed4e89623ee3, https://github.com/python/cpython/pull/160899, https://github.com/python/cpython

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -22d79d9840a275ed6ed36cd590dc74edc61765fb

    Affected versions

    v3.15.0b1
    v3.15.0a8
    v3.15.0a7
    v3.15.0a6
    v3.15.0a5
    v3.15.0a4
    v3.15.0a3
    v3.15.0a2
    v3.15.0a1

    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-2026-116566 | CVE-DB