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    CVE-2025-6021

    A flaw was found in libxml2's xmlBuildQName function, where integer overflows in buffer size calculations can lead to a stack-based buffer overflow. This issue can result in memory corruption or a denial of service when processing crafted input.

    Published:Jun 12, 2025
    Last Modified:Aug 31, 2026
    EPS:Jun 12, 2025
    EPSS Score:0.01165
    CVSS Score:7.5

    Affected Products

    Vendor
    Redhat
    Product
    Discovery
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Enterprise Linux Eus
    Vendor
    Redhat
    Product
    Enterprise Linux For Arm 64
    Vendor
    Redhat
    Product
    Enterprise Linux For Arm 64 Eus
    Vendor
    Redhat
    Product
    Enterprise Linux For Ibm Z Systems
    Vendor
    Redhat
    Product
    Enterprise Linux For Ibm Z Systems Eus
    Vendor
    Redhat
    Product
    Enterprise Linux For Power Little Endian
    Vendor
    Redhat
    Product
    Enterprise Linux For Power Little Endian Eus
    Vendor
    Redhat
    Product
    Enterprise Linux Server
    Vendor
    Redhat
    Product
    Enterprise Linux Server Aus
    Vendor
    Redhat
    Product
    Enterprise Linux Server For Power Little Endian Update Services For Sap Solutions
    Vendor
    Redhat
    Product
    Enterprise Linux Server Tus
    Vendor
    Redhat
    Product
    Hummingbird
    Vendor
    Redhat
    Product
    In-vehicle Operating System
    Vendor
    Redhat
    Product
    Insights Proxy
    Vendor
    Redhat
    Product
    Jboss Core Services
    Vendor
    Redhat
    Product
    Openshift
    Vendor
    Redhat
    Product
    Openshift Container Platform
    Vendor
    Redhat
    Product
    Openshift Container Platform For Arm64
    Vendor
    Redhat
    Product
    Openshift Container Platform For Ibm Z
    Vendor
    Redhat
    Product
    Openshift Container Platform For Linuxone
    Vendor
    Redhat
    Product
    Openshift Container Platform For Power
    Vendor
    Redhat
    Product
    Rhel Aus
    Vendor
    Redhat
    Product
    Rhel E4s
    Vendor
    Redhat
    Product
    Rhel Els
    Vendor
    Redhat
    Product
    Rhel Eus
    Vendor
    Redhat
    Product
    Rhel Eus Long Life
    Vendor
    Redhat
    Product
    Rhel Tus
    Vendor
    Xmlsoft
    Product
    Libxml2

    Exploits

    https://gitlab.gnome.org/GNOME/libxml2/-/issues/926https://gitlab.gnome.org/GNOME/libxml2/-/issues/926

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-92 Forced Integer Overflow

    Related CVEs

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    CVE-2026-15588 (CVSS 5.3) — A denial-of-service and resource exhaustion vulnerability exists within the `GDBus` component of GLib. The `gd…
    CVE-2026-58016 (CVSS 7.5) — A flaw was found in GLib. A state confusion issue exists in g_dbus_node_info_new_for_xml() in the gio/gdbusint…
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    CVE-2026-58014 (CVSS 7.3) — A flaw was found in GLib. An off-by-one error can occur in the g_key_file_get_locale_string_list function in t…
    CVE-2026-58013 (CVSS 6.5) — A flaw was found in GLib. A buffer over-read can occur in g_io_channel_read_line_backend() in the giochannel.c…
    CVE-2026-58012 (CVSS 6.5) — A flaw was found in GLib. A buffer over-read can occur in the g_regex_replace function when used with the `G_R…
    CVE-2026-58011 (CVSS 6.5) — A flaw was found in GLib. An out-of-bounds read of only 2 bytes can occur in the g_date_time_get_ymd function …
    CVE-2026-58010 (CVSS 6.5) — A flaw was found in GLib. An off-by-one error can occur in the gvs_tuple_is_normal function in the glib/gvaria…

    References

    https://access.redhat.com/errata/RHSA-2025:10630
    https://access.redhat.com/errata/RHSA-2025:10698
    https://access.redhat.com/errata/RHSA-2025:10699
    https://access.redhat.com/errata/RHSA-2025:11580
    https://access.redhat.com/errata/RHSA-2025:11673
    https://access.redhat.com/errata/RHSA-2025:12098
    https://access.redhat.com/errata/RHSA-2025:12099
    https://access.redhat.com/errata/RHSA-2025:12199
    https://access.redhat.com/errata/RHSA-2025:12237
    https://access.redhat.com/errata/RHSA-2025:12239
    https://access.redhat.com/errata/RHSA-2025:12240
    https://access.redhat.com/errata/RHSA-2025:12241
    https://access.redhat.com/errata/RHSA-2025:13267
    https://access.redhat.com/errata/RHSA-2025:13289
    https://access.redhat.com/errata/RHSA-2025:13325
    https://access.redhat.com/errata/RHSA-2025:13335
    https://access.redhat.com/errata/RHSA-2025:13336
    https://access.redhat.com/errata/RHSA-2025:14059
    https://access.redhat.com/errata/RHSA-2025:14396
    https://access.redhat.com/errata/RHSA-2025:15308
    https://access.redhat.com/errata/RHSA-2025:15672
    https://access.redhat.com/errata/RHSA-2025:19020
    https://access.redhat.com/errata/RHSA-2026:7519
    https://access.redhat.com/security/cve/CVE-2025-6021
    https://bugzilla.redhat.com/show_bug.cgi?id=2372406
    https://gitlab.gnome.org/GNOME/libxml2/-/issues/926
    https://lists.debian.org/debian-lts-announce/2025/07/msg00014.html
    https://cert-portal.siemens.com/productcert/html/ssa-032379.html
    https://gitlab.gnome.org/GNOME/libxml2/-/issues/926

    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