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    CVE-2024-34459

    An issue was discovered in xmllint (from libxml2) before 2.11.8 and 2.12.x before 2.12.7. Formatting error messages with xmllint --htmlout can result in a buffer over-read in xmlHTMLPrintFileContext in xmllint.c.

    Published:May 8, 2024
    Last Modified:Nov 4, 2025
    EPS:May 13, 2024
    EPSS Score:0.00529
    CVSS Score:7.5

    Affected Products

    Vendor
    Xmlsoft
    Product
    Libxml2
    Vendor
    Xmlsoft
    Product
    Xmllint

    Exploits

    https://gitlab.gnome.org/GNOME/libxml2/-/issues/720https://gitlab.gnome.org/GNOME/libxml2/-/issues/720

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-92 Forced Integer Overflow

    Related CVEs

    CVE-2026-86144 (CVSS 5.6) — In xinclude in libxml2 before 2.15.4, xmlXIncludeProcess and xmlXIncludeProcessTree do not propagate parseFlag…
    CVE-2026-86143 (CVSS 6.9) — In xmlIO in libxml2 before 2.15.4, an inconsistency in xmlOutputWriteCallback and xmlBufUse causes negative le…
    CVE-2026-86142 (CVSS 6.9) — In libxml2 before 2.15.4, there is a heap-based buffer overflow in xmlXPtrEvalXPtrPart because of xmlXPtrEval …
    CVE-2026-86141 (CVSS 2.9) — xmlregexp in libxml2 before 2.15.4 has a NULL pointer dereference in xmlRegNewParserCtxt after a strdup failur…
    CVE-2026-86140 (CVSS 8) — In libxml2 before 2.15.4, xmlSnprintfElements in valid.c has a strcat stack-based buffer overflow.…
    CVE-2026-86139 (CVSS 6.9) — In libxml2 before 2.15.4, xmlURIEscapeStr in uri.c has an integer overflow.…
    CVE-2026-86138 (CVSS 6.9) — In libxml2 before 2.15.4, xmlDictAddQString in dict.c has an integer overflow and resultant heap-based buffer …
    CVE-2026-86137 (CVSS 2.9) — In libxml2 before 2.15.4, xmlFAParsePosCharGroup has an out-of-bounds read, aka an out-of-bounds read in the N…
    CVE-2026-11979 (CVSS 1.8) — libxml2 is vulnerable to multiple stack-based buffer overflows in the xmlcatalog utility when running in --she…
    CVE-2026-6732 (CVSS 6.5) — A flaw was found in libxml2. This vulnerability occurs when the library processes a specially crafted XML Sche…

    References

    https://gitlab.gnome.org/GNOME/libxml2/-/issues/720
    https://gitlab.gnome.org/GNOME/libxml2/-/releases/v2.11.8
    https://gitlab.gnome.org/GNOME/libxml2/-/releases/v2.12.7
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5HVUXKYTBWT3G5DEEQX62STJQBY367NL/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/INKSSLW5VMZIXHRPZBAW4TJUX5SQKARG/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VRDJCNQP32LV56KESUQ5SNZKAJWSZZRI/
    https://gitlab.gnome.org/GNOME/libxml2/-/issues/720
    https://gitlab.gnome.org/GNOME/libxml2/-/releases/v2.11.8
    https://gitlab.gnome.org/GNOME/libxml2/-/releases/v2.12.7
    https://lists.debian.org/debian-lts-announce/2025/07/msg00014.html
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5HVUXKYTBWT3G5DEEQX62STJQBY367NL/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/INKSSLW5VMZIXHRPZBAW4TJUX5SQKARG/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VRDJCNQP32LV56KESUQ5SNZKAJWSZZRI/
    https://lists.fedoraproject.org/archives/list/[email protected]/message/5HVUXKYTBWT3G5DEEQX62STJQBY367NL/
    https://lists.fedoraproject.org/archives/list/[email protected]/message/INKSSLW5VMZIXHRPZBAW4TJUX5SQKARG/
    https://lists.fedoraproject.org/archives/list/[email protected]/message/VRDJCNQP32LV56KESUQ5SNZKAJWSZZRI/

    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