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Libxml2 CVE-2025-6021

| EUVDEUVD-2025-18175 HIGH
Integer Overflow or Wraparound (CWE-190)
2025-06-12 secalert@redhat.com
Buffer Overflow Denial Of Service Integer Overflow Libxml2 Jboss Core Services Openshift Container Platform Openshift Container Platform For Arm64 Openshift Container Platform For Ibm Z Openshift Container Platform For Linuxone Openshift Container Platform For Power Enterprise Linux Enterprise Linux Eus Enterprise Linux For Arm 64 Enterprise Linux For Arm 64 Eus Enterprise Linux For Ibm Z Systems Enterprise Linux For Ibm Z Systems Eus Enterprise Linux For Power Little Endian Enterprise Linux For Power Little Endian Eus Enterprise Linux Server Enterprise Linux Server Aus Enterprise Linux Server For Power Little Endian Update Services For Sap Solutions Enterprise Linux Server Tus In Vehicle Operating System
7.5
CVSS 3.1 · Vendor: redhat
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Severity by source

Vendor (redhat) PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Ubuntu
MEDIUM
qualitative
SUSE
HIGH
qualitative
Red Hat
7.5 MEDIUM
qualitative

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

7
Analysis Updated
Apr 19, 2026 - 20:32 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Apr 19, 2026 - 20:22 vuln.today
cvss_changed
Patch released
Mar 31, 2026 - 21:13 nvd
Patch available
PoC Detected
Mar 24, 2026 - 12:16 vuln.today
Public exploit code
EUVD ID Assigned
Mar 14, 2026 - 21:20 euvd
EUVD-2025-18175
Analysis Generated
Mar 14, 2026 - 21:20 vuln.today
CVE Published
Jun 12, 2025 - 13:15 nvd
HIGH 7.5

DescriptionCVE.org

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.

AnalysisAI

Stack-based buffer overflow in libxml2's xmlBuildQName function allows remote unauthenticated attackers to crash affected systems via crafted XML input. The vulnerability affects libxml2 directly and downstream Red Hat products including OpenShift Container Platform 4.12-4.19, RHEL 7-10, and JBoss Core Services. With CVSS 7.5 (AV:N/AC:L/PR:N/UI:N), EPSS 0.75% (73rd percentile), and publicly available exploit code, this represents a moderate real-world risk focused on availability disruption rather than code execution or data compromise.

Technical ContextAI

Libxml2 is a widely-deployed XML parsing library used across Linux distributions and enterprise platforms. The xmlBuildQName function performs qualified name construction during XML processing, combining namespace prefixes and local names into QNames. CWE-190 (integer overflow) occurs when buffer size calculations overflow, causing the function to allocate insufficient stack space. Subsequent operations write beyond the allocated buffer, corrupting stack memory. The vulnerability affects the core libxml2 library (cpe:2.3:a:xmlsoft:libxml2) and propagates to all downstream consumers including Red Hat Enterprise Linux 7/8/9/10, OpenShift Container Platform across multiple major versions (4.12-4.18), and specialized variants like Telecommunications Update Service and Extended Lifecycle Support editions. Ubuntu and Debian have also confirmed impact across multiple releases.

RemediationAI

Apply vendor-released patches immediately for internet-facing systems processing untrusted XML. For Red Hat Enterprise Linux, upgrade libxml2 to fixed versions: RHEL 7 to 0:2.9.1-6.el7_9.10, RHEL 8 to 0:2.9.7-21.el8_10.1 (or version-specific patches per support tier), RHEL 9 to 0:2.9.13-10.el9_6, RHEL 10 to 0:2.12.5-7.el10_0. OpenShift Container Platform administrators should apply platform-specific updates via Red Hat Security Advisories RHSA-2025:12237 through RHSA-2025:13325 matching their cluster version. Ubuntu users should install updates from USN-7694-1, Debian users from DLA-4251-1. If patching cannot be completed immediately, implement compensating controls: restrict XML processing endpoints to authenticated users only (reduces attack surface from AV:N to trusted networks), deploy XML input validation and size limits before libxml2 parsing (blocks oversized crafted inputs but adds processing overhead and may break legitimate large documents), enable application-level request throttling to limit DoS impact (does not prevent exploitation but contains blast radius), and monitor for abnormal process crashes in XML-consuming services. Note that input validation is bypass-prone against novel integer overflow vectors and should be considered temporary mitigation only.

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CVE-2013-1969 HIGH POC
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Same weakness CWE-190 – Integer Overflow or Wraparound

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9.3
CVE-2017-3599 HIGH POC
7.5
CVE-2017-7529 HIGH
7.5
CVE-2016-1010 HIGH
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CVE-2013-3940 CRITICAL
9.3

Same technique Buffer Overflow

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9.8
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7.8
CVE-2010-3333 HIGH POC
7.8

Vendor StatusVendor

Ubuntu

Priority: Medium
libxml2
Release Status Version
bionic released 2.9.4+dfsg1-6.1ubuntu1.9+esm4
focal released 2.9.10+dfsg-5ubuntu0.20.04.10+esm1
jammy released 2.9.13+dfsg-1ubuntu0.8
noble released 2.9.14+dfsg-1.3ubuntu3.4
plucky released 2.12.7+dfsg+really2.9.14-0.4ubuntu0.2
trusty released 2.9.1+dfsg1-3ubuntu4.13+esm8
upstream released -
xenial released 2.9.3+dfsg1-1ubuntu0.7+esm9
oracular ignored end of life, was needs-triage
USN-7694-1

Debian

Bug #1107720
libxml2
Release Status Fixed Version Urgency
bullseye fixed 2.9.10+dfsg-6.7+deb11u8 -
bullseye (security) fixed 2.9.10+dfsg-6.7+deb11u9 -
bookworm fixed 2.9.14+dfsg-1.3~deb12u3 -
bookworm (security) fixed 2.9.14+dfsg-1.3~deb12u4 -
trixie fixed 2.12.7+dfsg+really2.9.14-2.1+deb13u2 -
trixie (security) fixed 2.12.7+dfsg+really2.9.14-2.1+deb13u1 -
forky, sid fixed 2.15.1+dfsg-2 -
(unstable) fixed 2.12.7+dfsg+really2.9.14-2 -
DLA-4251-1

SUSE

Severity: High
Product Status
Container bci/kiwi:9.24.43-16.25 Image SLES15-SP7-SAPCAL-Azure Image SLES15-SP7-SAPCAL-EC2 Image SLES15-SP7-SAPCAL-GCE Affected
Container bci/spack:0.23.1-11.20 Container containers/lmcache-vllm-openai:0.3.2-1.2 Container containers/open-webui:0.6.9-10.36 Container containers/pytorch:2.7.0-nvidia-2.33 Container containers/vllm-openai:0.9.1-1.2 Container private-registry/harbor-db:2.12.2-2.16 Container private-registry/harbor-nginx:1.21.5-2.15 Container suse/manager/5.0/x86_64/proxy-salt-broker:5.0.5.1.7.28.2 Container suse/manager/5.0/x86_64/proxy-squid:5.0.5.1.7.26.1 Container suse/manager/5.0/x86_64/server-migration-14-16:5.0.5.1.7.26.2 Container suse/mariadb:10.11.11-68.18 Container suse/sle-micro/5.5/toolbox:14.2-3.12.59 Container suse/sle-micro/5.5:2.0.4-5.5.329 Container suse/sle-micro/base-5.5:2.0.4-5.8.185 Container suse/sle-micro/kvm-5.5:2.0.4-3.5.354 Container suse/sle-micro/rt-5.5:2.0.4-4.5.430 Image SLES15-SP5-Azure-3P Image SLES15-SP5-Azure-Basic Image SLES15-SP5-Azure-Standard Image SLES15-SP5-BYOS-Azure Image SLES15-SP5-BYOS-EC2 Image SLES15-SP5-BYOS-GCE Image SLES15-SP5-CHOST-BYOS-Aliyun Image SLES15-SP5-CHOST-BYOS-Azure Image SLES15-SP5-CHOST-BYOS-EC2 Image SLES15-SP5-CHOST-BYOS-GCE Image SLES15-SP5-CHOST-BYOS-GDC Image SLES15-SP5-CHOST-BYOS-SAP-CCloud Image SLES15-SP5-EC2 Image SLES15-SP5-GCE Image SLES15-SP5-HPC-Azure Image SLES15-SP5-HPC-BYOS-Azure Image SLES15-SP5-HPC-BYOS-EC2 Image SLES15-SP5-HPC-BYOS-GCE Image SLES15-SP5-Hardened-BYOS-Azure Image SLES15-SP5-Hardened-BYOS-EC2 Image SLES15-SP5-Hardened-BYOS-GCE Image SLES15-SP6 Image SLES15-SP6-Azure-3P Image SLES15-SP6-Azure-Basic Image SLES15-SP6-Azure-Standard Image SLES15-SP6-BYOS Image SLES15-SP6-BYOS-Azure Image SLES15-SP6-BYOS-EC2 Image SLES15-SP6-BYOS-GCE Image SLES15-SP6-CHOST-BYOS Image SLES15-SP6-CHOST-BYOS-Aliyun Image SLES15-SP6-CHOST-BYOS-Azure Image SLES15-SP6-CHOST-BYOS-EC2 Image SLES15-SP6-CHOST-BYOS-GCE Image SLES15-SP6-CHOST-BYOS-GDC Image SLES15-SP6-CHOST-BYOS-SAP-CCloud Image SLES15-SP6-EC2 Image SLES15-SP6-EC2-ECS-HVM Image SLES15-SP6-GCE Image SLES15-SP6-HPC Image SLES15-SP6-HPC-Azure Image SLES15-SP6-HPC-BYOS Image SLES15-SP6-HPC-BYOS-Azure Image SLES15-SP6-HPC-BYOS-EC2 Image SLES15-SP6-HPC-BYOS-GCE Image SLES15-SP6-HPC-EC2 Image SLES15-SP6-HPC-GCE Image SLES15-SP6-Hardened-BYOS Image SLES15-SP6-Hardened-BYOS-Azure Image SLES15-SP6-Hardened-BYOS-EC2 Image SLES15-SP6-Hardened-BYOS-GCE Image ai_15_6 Affected
Container private-registry/harbor-portal:1.1.0-1.1 Container suse/hpc/warewulf4-x86_64/sle-hpc-node:15.7.20.5.1 Container suse/multi-linux-manager/5.1/x86_64/proxy-httpd:5.1.0.6.27 Container suse/multi-linux-manager/5.1/x86_64/proxy-salt-broker:5.1.0.7.32 Container suse/multi-linux-manager/5.1/x86_64/proxy-squid:5.1.0.6.21 Container suse/multi-linux-manager/5.1/x86_64/server-migration-14-16:5.1.0.6.27 Container suse/multi-linux-manager/5.1/x86_64/server-postgresql:5.1.2.6.13.1 Container suse/multi-linux-manager/5.1/x86_64/server-saline:5.1.2.9.13.1 Image SLES15-SP7-Azure-3P Image SLES15-SP7-Azure-Basic Image SLES15-SP7-Azure-Standard Image SLES15-SP7-BYOS-Azure Image SLES15-SP7-BYOS-EC2 Image SLES15-SP7-BYOS-GCE Image SLES15-SP7-CHOST-BYOS-Aliyun Image SLES15-SP7-CHOST-BYOS-Azure Image SLES15-SP7-CHOST-BYOS-EC2 Image SLES15-SP7-CHOST-BYOS-GCE Image SLES15-SP7-CHOST-BYOS-GDC Image SLES15-SP7-CHOST-BYOS-SAP-CCloud Image SLES15-SP7-EC2 Image SLES15-SP7-EC2-ECS-HVM Image SLES15-SP7-GCE Image SLES15-SP7-GCE-3P Image SLES15-SP7-HPC-Azure Image SLES15-SP7-HPC-BYOS-Azure Image SLES15-SP7-HPC-BYOS-EC2 Image SLES15-SP7-HPC-BYOS-GCE Image SLES15-SP7-Hardened-BYOS-Azure Image SLES15-SP7-Hardened-BYOS-EC2 Image SLES15-SP7-Hardened-BYOS-GCE Image proxy-httpd-image Image proxy-salt-broker-image Image proxy-squid-image Image server-database-migration-image Image server-image Image server-migration-14-16-image Image server-postgresql-image Image server-saline-image Affected
Container suse/ltss/sle12.5/sles12sp5:8.5.107 Image SLES12-SP5-Azure-BYOS Image SLES12-SP5-Azure-HPC-BYOS Image SLES12-SP5-Azure-HPC-On-Demand Image SLES12-SP5-Azure-Standard-On-Demand Image SLES12-SP5-EC2-BYOS Image SLES12-SP5-EC2-ECS-On-Demand Image SLES12-SP5-EC2-On-Demand Image SLES12-SP5-GCE-BYOS Image SLES12-SP5-GCE-On-Demand Affected
Container suse/manager/4.3/proxy-httpd:4.3.15.9.63.43 Image SLES15-SP4-Manager-Proxy-4-3-BYOS Image SLES15-SP4-Manager-Proxy-4-3-BYOS-Azure Image SLES15-SP4-Manager-Proxy-4-3-BYOS-EC2 Image SLES15-SP4-Manager-Proxy-4-3-BYOS-GCE Affected

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CVE-2025-6021 vulnerability details – vuln.today
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