CVE-2025-6021

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

Description

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.

Remediation

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.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.04%
Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com
Affected: Red Hat Red Hat Enterprise Linux 10
Affected: Red Hat Red Hat Enterprise Linux 8
Affected: Red Hat Red Hat Enterprise Linux 8
Affected: Red Hat Red Hat Enterprise Linux 9
Affected: Red Hat Red Hat Enterprise Linux 9
Affected: Red Hat Red Hat Enterprise Linux 6
Affected: Red Hat Red Hat Enterprise Linux 7
Affected: Red Hat Red Hat JBoss Core Services
Affected: Red Hat Red Hat OpenShift Container Platform 4
Published at:
Updated at:

References

Link Tags
https://access.redhat.com/errata/RHSA-2025:10630 vendor advisory
https://access.redhat.com/errata/RHSA-2025:10698 vendor advisory
https://access.redhat.com/errata/RHSA-2025:10699 vendor advisory
https://access.redhat.com/security/cve/CVE-2025-6021 vdb entry
https://bugzilla.redhat.com/show_bug.cgi?id=2372406 issue tracking

Frequently Asked Questions

What is the severity of CVE-2025-6021?
CVE-2025-6021 has been scored as a high severity vulnerability.
How to fix CVE-2025-6021?
As a workaround for remediating CVE-2025-6021: 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.
Is CVE-2025-6021 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-6021 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-6021?
CVE-2025-6021 affects Red Hat Red Hat Enterprise Linux 10, Red Hat Red Hat Enterprise Linux 8, Red Hat Red Hat Enterprise Linux 8, Red Hat Red Hat Enterprise Linux 9, Red Hat Red Hat Enterprise Linux 9, Red Hat Red Hat Enterprise Linux 6, Red Hat Red Hat Enterprise Linux 7, Red Hat Red Hat JBoss Core Services, Red Hat Red Hat OpenShift Container Platform 4.
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