CVE-2026-86143

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    CVE-2026-86143

    Published: 5 Sept 2026Last Modified: 25 Sept 2026

    Summary:

    Details: In xmlIO in libxml2 before 2.15.4, an inconsistency in xmlOutputWriteCallback and xmlBufUse causes negative lengths to reach write callbacks, aka a lack of a check for integer overflow before calling writecallback. This has security relevance for many types of uses of that length value within a callback.

    References: https://github.com/GNOME/libxml2/compare/v2.15.3...v2.15.4, https://gitlab.gnome.org/GNOME/libxml2/-/work_items/1111, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86143.json, https://nvd.nist.gov/vuln/detail/CVE-2026-86143, https://github.com/GNOME/libxml2/commit/90f293ba74d28b1d570920382e707586f68ebf35

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -96498992efa48d52b0e8b83058bd88dbdaf153c1

    Affected versions

    v2.15.3
    v2.15.2
    v2.15.1
    v2.15.0

    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-2026-86143 | CVE-DB