CVE-2026-123202

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    CVE-2026-123202

    Published: 5 Nov 2026Last Modified: 7 Nov 2026

    Summary: libnxml before 0.18.6 Stack-based Buffer Overflow via long multi-byte XML name

    Details: libnxml before 0.18.6 contains a stack-based buffer overflow vulnerability in src/nxml_parser.c that allows remote attackers to write past a 1024-byte stack buffer via long XML names. Attackers can supply XML or RSS feeds with a 1022-character element, attribute, DOCTYPE or entity name ending in a multi-byte UTF-8 character to crash parsing applications.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/123xxx/CVE-2026-123202.json, https://github.com/bakulf/libnxml/releases/tag/0.18.6, https://nvd.nist.gov/vuln/detail/CVE-2026-123202, https://www.vulncheck.com/advisories/libnxml-before-0.18.6-stack-based-buffer-overflow-via-long-multi-byte-xml-name, https://github.com/bakulf/libnxml/commit/fbac242374883edf2ec14127ca6d2accf4704b6a, https://github.com/bakulf/libnxml, https://github.com/bakulf/libnxml/blob/9272d1cd6fee88fe7fd4fd812736d95a6ba25f2f/src/nxml_parser.c#L952-L958

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -a1b63cf1db05dc861f55e7a5a39300dbd408cac6

    Affected versions

    0.18.5
    0.18.3

    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-2026-123202 | CVE-DB