CVE-2025-6021

Libxml2: integer overflow in xmlbuildqname() leads to stack buffer overflow in libxml2

publishedCWE-787

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.

Technical severity7.5 highCVSS 3.1 · CNA: redhat

Published2025-06-12Source updated 2026-11-05

Collected2026-11-053 attributed sources

Fixes and workarounds

Workaround

Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability. Users are strongly advised to apply vendor-supplied patches as soon as they become available to address the underlying integer overflow flaw in the affected code.

Source: CNA: redhat

Affected products and versions

Affected products, source version ranges and reporting authorities
Product	Versions	Authority
`libxml2` https://gitlab.gnome.org/GNOME/libxml2/	≥ 0; < 2.14.4 (affected, semver) Other versions: unaffected	CNA: redhat
Red Hat Enterprise Linux 10 Red Hat `libxml2` https://access.redhat.com/downloads/content/package-browser/	≥ 0:2.12.5-7.el10_0; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 7 Extended Lifecycle Support Red Hat `libxml2` https://access.redhat.com/downloads/content/package-browser/	≥ 0:2.9.1-6.el7_9.10; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8 Red Hat `libxml2` https://access.redhat.com/downloads/content/package-browser/	≥ 0:2.9.7-21.el8_10.1; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8.2 Advanced Update Support Red Hat `libxml2` https://access.redhat.com/downloads/content/package-browser/	≥ 0:2.9.7-9.el8_2.3; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support Red Hat `libxml2` https://access.redhat.com/downloads/content/package-browser/	≥ 0:2.9.7-9.el8_4.6; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On Red Hat `libxml2` https://access.redhat.com/downloads/content/package-browser/	≥ 0:2.9.7-9.el8_4.6; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Red Hat `libxml2` https://access.redhat.com/downloads/content/package-browser/	≥ 0:2.9.7-13.el8_6.10; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8.6 Telecommunications Update Service Red Hat `libxml2` https://access.redhat.com/downloads/content/package-browser/	≥ 0:2.9.7-13.el8_6.10; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions Red Hat `libxml2` https://access.redhat.com/downloads/content/package-browser/	≥ 0:2.9.7-13.el8_6.10; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8.8 Telecommunications Update Service Red Hat `libxml2` https://access.redhat.com/downloads/content/package-browser/	≥ 0:2.9.7-16.el8_8.9; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Red Hat `libxml2` https://access.redhat.com/downloads/content/package-browser/	≥ 0:2.9.7-16.el8_8.9; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 9 Red Hat `libxml2` https://access.redhat.com/downloads/content/package-browser/	≥ 0:2.9.13-10.el9_6; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions Red Hat `libxml2` https://access.redhat.com/downloads/content/package-browser/	≥ 0:2.9.13-1.el9_0.5; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Red Hat `libxml2` https://access.redhat.com/downloads/content/package-browser/	≥ 0:2.9.13-3.el9_2.7; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 9.4 Extended Update Support Red Hat `libxml2` https://access.redhat.com/downloads/content/package-browser/	≥ 0:2.9.13-10.el9_4; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat JBoss Core Services 2.4.62.SP2 Red Hat `libxml2` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unaffected	CNA: redhat
Red Hat OpenShift Container Platform 4.12 Red Hat `openshift/ose-rhel-coreos-8` https://access.redhat.com/downloads/content/package-browser/	≥ 412.86.202509030110-0; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat OpenShift Container Platform 4.13 Red Hat `openshift/ose-rhel-coreos-9` https://access.redhat.com/downloads/content/package-browser/	≥ 413.92.202509030117-0; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat OpenShift Container Platform 4.14 Red Hat `openshift/ose-rhel-coreos-9` https://catalog.redhat.com/software/containers/	≥ 414.92.202508041909-0; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat OpenShift Container Platform 4.15 Red Hat `openshift/ose-rhel-coreos-9` https://access.redhat.com/downloads/content/package-browser/	≥ 415.92.202508192014-0; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat OpenShift Container Platform 4.16 Red Hat `openshift/ose-rhel-coreos-9` https://catalog.redhat.com/software/containers/	≥ 416.94.202508050040-0; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat OpenShift Container Platform 4.17 Red Hat `openshift/ose-rhel-coreos-9` https://access.redhat.com/downloads/content/package-browser/	≥ 417.94.202508141510-0; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat OpenShift Container Platform 4.18 Red Hat `openshift/ose-rhel-coreos-9` https://catalog.redhat.com/software/containers/	≥ 418.94.202508060022-0; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat OpenShift Container Platform 4.19 Red Hat `openshift/ose-rhel-coreos-9` https://catalog.redhat.com/software/containers/	≥ 4.19.9.6.202507230107-0; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Discovery 2 Red Hat `discovery/discovery-server-rhel9` https://catalog.redhat.com/software/containers/	≥ 2.0.1-1754478727; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Hardened Images Red Hat `libxml2-main` https://catalog.redhat.com/software/containers/	≥ 2.15.2-0.3.hum1; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Insights proxy 1.5 Red Hat `insights-proxy/insights-proxy-container-rhel9` https://catalog.redhat.com/software/containers/	≥ 1.5.5-1754504343; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 6 Red Hat `libxml2` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unknown	CNA: redhat
SIMATIC CN 4100 Siemens	≥ 0; < V5.0 (affected, custom) Other versions: unknown	ADP: siemens-SADP

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

NVD applicability configurations (2)

These expressions retain AND/OR operators, negation, and required environmental products. A listed product is not sufficient to establish exposure when additional conditions apply.

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          {
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        "negate": false,
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]

CVSS assessments

CVSS scores, vectors and reporting authorities
Version / score	Vector	Authority
3.1 / 7.5 high	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`	CNA: redhat
3.1 / 7.5 high	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`	NVD: [email protected]

Exploit evidence

https://gitlab.gnome.org/GNOME/libxml2/-/issues/926
exploit · ADP: CISA-ADP
https://gitlab.gnome.org/GNOME/libxml2/-/issues/926
exploit · [email protected]
https://gitlab.gnome.org/GNOME/libxml2/-/issues/926
exploit · 134c704f-9b21-4f2e-91b3-4a467353bcc0

References

https://access.redhat.com/errata/RHSA-2025:10630CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:10698CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:10699CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:11580CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:11673CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:12098CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:12099CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:12199CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:12237CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:12239CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:12240CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:12241CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:13267CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:13289CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:13325CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:13335CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:13336CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:14059CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:14396CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:15308CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:15672CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:19020CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:7519CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2025-6021CNA: redhat · vdb-entry, x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2372406CNA: redhat · issue-tracking, x_refsource_REDHAT
https://gitlab.gnome.org/GNOME/libxml2/-/issues/926CNA: redhat
https://gitlab.gnome.org/GNOME/libxml2/-/issues/926ADP: CISA-ADP · exploit, issue-tracking
https://lists.debian.org/debian-lts-announce/2025/07/msg00014.htmlADP: CVE
https://cert-portal.siemens.com/productcert/html/ssa-032379.htmlADP: siemens-SADP
https://access.redhat.com/errata/RHSA-2025:10630[email protected] · Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:10698[email protected] · Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:10699[email protected] · Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:11580[email protected] · Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:11673[email protected]
https://access.redhat.com/errata/RHSA-2025:12098[email protected] · Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:12099[email protected] · Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:12199[email protected] · Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:12237[email protected] · Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:12239[email protected] · Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:12240[email protected] · Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:12241[email protected] · Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:13267[email protected] · Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:13289[email protected] · Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:13325[email protected] · Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:13335[email protected] · Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:13336[email protected] · Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:14059[email protected] · Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:14396[email protected] · Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:15308[email protected] · Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:15672[email protected] · Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:19020[email protected]
https://access.redhat.com/errata/RHSA-2026:7519[email protected]
https://access.redhat.com/security/cve/CVE-2025-6021[email protected] · Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2372406[email protected] · Issue Tracking
https://gitlab.gnome.org/GNOME/libxml2/-/issues/926[email protected] · Exploit, Issue Tracking, Vendor Advisory
https://lists.debian.org/debian-lts-announce/2025/07/msg00014.htmlaf854a3a-2127-422b-91ae-364da2661108
https://cert-portal.siemens.com/productcert/html/ssa-032379.html0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
https://gitlab.gnome.org/GNOME/libxml2/-/issues/926134c704f-9b21-4f2e-91b3-4a467353bcc0 · Exploit, Issue Tracking, Vendor Advisory

For agents and automation

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