`CVE-2025-6021` libxml2

Affected software	libxml2
Severity	7.5 High CVSS 3.1
Weakness	Out-of-bounds write (CWE-787)
Published	12 Jun 2025
Updated	13 Nov 2026

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.

Exploitation status

Proof of concept only

A proof of concept exists, but no reviewed exploit catalogue lists this CVE.

CISA KEV not listed
VulnCheck KEV not listed
CISA Vulnrichment exploitation: poc CISA recorded that an exploit has been demonstrated. Automatable: yes, technical impact: partial.
Indexed PoC none indexed
EPSS 1.5% chance in 30 days

Waratek protection

Outside Waratek scope

A Java vulnerability, but not one Waratek protects. It affects only Java on a user's desktop (applets, Web Start, JavaFX, the installer), sits in a product the Waratek agent can't be installed into, or is in a package we don't expect in business applications. The decision below says which.

Protection none
Action not pursued none
Review human Researcher
Record active

Decided by	A researcher's recorded decision for this specific CVE
Finding	A researcher set this CVE's status to Outside Waratek scope.

Decided by

A researcher's recorded decision for this specific CVE

Finding

A researcher set this CVE's status to Outside Waratek scope.

Waratek research note

written 2026-11-13

Written by a Waratek engineer who reviewed this CVE. Their decision sets the status above, ahead of every automated rule except a withdrawal.

https://www.oracle.com/security-alerts/cpujan2026.html

This vulnerability applies to Java deployments, typically in clients running sandboxed Java Web Start applications or sandboxed Java applets, that load and run untrusted code (e.g., code that comes from the internet) and rely on the Java sandbox for security. This vulnerability does not apply to Java deployments, typically in servers, that load and run only trusted code (e.g., code installed by an administrator).

Affected software and releases

Oracle advisories

Advisory	Type	Quarter	Products Oracle names in its risk matrix
Oracle Critical Patch Update January 2026 ↗	CPU	2026-Q1	Oracle Java SE / JavaFX (libxml2) (Oracle Java SE: 8u471-b50) Oracle's note: This vulnerability applies to Java deployments, typically in clients running sandboxed Java Web Start applications or sandboxed Java applets, that load and run untrusted code (e.g., code that comes from the internet) and rely on the Java sandbox for security. This vulnerability does not apply to Java deployments, typically in servers, that load and run only trusted code (e.g., code installed by an administrator).
Oracle Critical Patch Update October 2025 ↗	CPU	2025-Q4	Oracle Communications / Configuration (libxml2) (25.1.200)

Advisory

Type

Quarter

Products Oracle names in its risk matrix

Oracle Critical Patch Update January 2026 ↗

CPU

2026-Q1

Oracle Java SE / JavaFX (libxml2) (Oracle Java SE: 8u471-b50)
Oracle's note: This vulnerability applies to Java deployments, typically in clients running sandboxed Java Web Start applications or sandboxed Java applets, that load and run untrusted code (e.g., code that comes from the internet) and rely on the Java sandbox for security. This vulnerability does not apply to Java deployments, typically in servers, that load and run only trusted code (e.g., code installed by an administrator).

Oracle Critical Patch Update October 2025 ↗

CPU

2025-Q4

Oracle Communications / Configuration (libxml2) (25.1.200)

Oracle components and versions

Family	Component	Versions, as Oracle lists them	Read as
Oracle Communications	Configuration (libxml2)	25.1.200	25.1.200
Oracle Java SE	JavaFX (libxml2)	Oracle Java SE: 8u471-b50	8.0.471.50

Family

Component

Versions, as Oracle lists them

Read as

Oracle Communications

Configuration (libxml2)

25.1.200

Oracle Java SE

JavaFX (libxml2)

Oracle Java SE: 8u471-b50

8.0.471.50

Products and versions

20 products, 72 version entries

Source	Vendor	Product	Scheme	Affected versions
nvd	redhat	enterprise linux	generic	8.0 · 9.0 · 10.0
nvd	redhat	enterprise linux eus	generic	8.4 · 8.6 · 8.8 · 9.4 · 9.6 · 10.0
nvd	redhat	enterprise linux for arm 64	generic	8.0_aarch64 · 9.0_aarch64 · 9.4_aarch64 · 10.0_aarch64
nvd	redhat	enterprise linux for arm 64 eus	generic	9.4_aarch64 · 9.6_aarch64 · 10.0_aarch64
nvd	redhat	enterprise linux for ibm z systems	generic	8.0_s390x · 9.4_s390x · 10.0_s390x
nvd	redhat	enterprise linux for ibm z systems eus	generic	9.0_s390x · 9.4_s390x · 9.6_s390x · 10.0_s390x
nvd	redhat	enterprise linux for power little endian	generic	8.0_ppc64le · 9.0_ppc64le · 10.0_ppc64le
nvd	redhat	enterprise linux for power little endian eus	generic	9.4_ppc64le · 9.6_ppc64le · 10.0_ppc64le
nvd	redhat	enterprise linux server	generic	7.0
nvd	redhat	enterprise linux server aus	generic	8.2 · 8.4 · 8.6 · 9.2 · 9.4 · 9.6
nvd	redhat	enterprise linux server for power little endian update services for sap solutions	generic	9.4_ppc64le
nvd	redhat	enterprise linux server tus	generic	8.8
nvd	redhat	in-vehicle operating system	generic	1.0
nvd	redhat	jboss core services	generic	any version
nvd	redhat	openshift container platform	generic	4.12 · 4.13 · 4.14 · 4.15 · 4.16 · 4.17 · 4.18
nvd	redhat	openshift container platform for arm64	generic	4.13 · 4.14 · 4.15 · 4.16 · 4.17 · 4.18
nvd	redhat	openshift container platform for ibm z	generic	4.13 · 4.14 · 4.15 · 4.16 · 4.17 · 4.18
nvd	redhat	openshift container platform for linuxone	generic	4.13 · 4.14 · 4.15 · 4.16 · 4.17 · 4.18
nvd	redhat	openshift container platform for power	generic	4.13 · 4.14 · 4.15 · 4.16 · 4.17 · 4.18
nvd	xmlsoft	libxml2	generic	＜ 2.14.4

Source

Vendor

Product

Scheme

Affected versions

nvd

redhat

enterprise linux

generic

8.0 · 9.0 · 10.0

nvd

redhat

enterprise linux eus

generic

8.4 · 8.6 · 8.8 · 9.4 · 9.6 · 10.0

nvd

redhat

enterprise linux for arm 64

generic

8.0_aarch64 · 9.0_aarch64 · 9.4_aarch64 · 10.0_aarch64

nvd

redhat

enterprise linux for arm 64 eus

generic

9.4_aarch64 · 9.6_aarch64 · 10.0_aarch64

nvd

redhat

enterprise linux for ibm z systems

generic

8.0_s390x · 9.4_s390x · 10.0_s390x

nvd

redhat

enterprise linux for ibm z systems eus

generic

9.0_s390x · 9.4_s390x · 9.6_s390x · 10.0_s390x

nvd

redhat

enterprise linux for power little endian

generic

8.0_ppc64le · 9.0_ppc64le · 10.0_ppc64le

nvd

redhat

enterprise linux for power little endian eus

generic

9.4_ppc64le · 9.6_ppc64le · 10.0_ppc64le

nvd

redhat

enterprise linux server

generic

7.0

nvd

redhat

enterprise linux server aus

generic

8.2 · 8.4 · 8.6 · 9.2 · 9.4 · 9.6

nvd

redhat

enterprise linux server for power little endian update services for sap solutions

generic

9.4_ppc64le

nvd

redhat

enterprise linux server tus

generic

8.8

nvd

redhat

in-vehicle operating system

generic

1.0

nvd

redhat

jboss core services

generic

any version

nvd

redhat

openshift container platform

generic

4.12 · 4.13 · 4.14 · 4.15 · 4.16 · 4.17 · 4.18

nvd

redhat

openshift container platform for arm64

generic

4.13 · 4.14 · 4.15 · 4.16 · 4.17 · 4.18

nvd

redhat

openshift container platform for ibm z

generic

4.13 · 4.14 · 4.15 · 4.16 · 4.17 · 4.18

nvd

redhat

openshift container platform for linuxone

generic

4.13 · 4.14 · 4.15 · 4.16 · 4.17 · 4.18

nvd

redhat

openshift container platform for power

generic

4.13 · 4.14 · 4.15 · 4.16 · 4.17 · 4.18

nvd

xmlsoft

libxml2

generic

＜ 2.14.4

References

URL	Tags
https://access.redhat.com/errata/RHSA-2025:10630	Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:10698	Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:10699	Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:11580	Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:11673
https://access.redhat.com/errata/RHSA-2025:12098	Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:12099	Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:12199	Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:12237	Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:12239	Third Party Advisory

URL

Timeline

Published	2025-06-12	By the CVE Program.
NVD record modified	2026-11-05	NVD's own last-modified date for this record.
Classification created	2026-11-13	First commit adding this CVE's research note.
Last VRT activity	2026-11-13	Most recent commit touching this CVE's classification, patch or rule file.

Published

2025-06-12

By the CVE Program.

NVD record modified

2026-11-05

NVD's own last-modified date for this record.

Classification created

2026-11-13

First commit adding this CVE's research note.

Last VRT activity

2026-11-13

Most recent commit touching this CVE's classification, patch or rule file.

How VRT decided (4 of 24 rules ran)

4 of 24 rules ran. The rest didn't run because an earlier rule had already settled the CVE.

# Rule Outcome Status Detail

identity: Does this identifier describe a vulnerability at all? the first rule that matches decides

1 rejected no match CVE Program withdrawal of this identifier

scope: Is it a vulnerability Waratek protects? the first rule that matches decides

2 armr-patch-file no match An ARMR patch file on disk for this CVE

3 armr-secure-rule-file no match An ARMR security-rule template on disk for this CVE

4 manual-classification decided it matched Outside Waratek scope A researcher set this CVE's status to Outside Waratek scope.

5 manual classification not reached Manual classification of this CVE in the legacy dataset

6 non-java-upstream not reached A root cause in non-Java code: an OS kernel, a C library, or a bundled runtime

7 oracle-component not reached The defect being in a component of a tracked product the agent does not reach: JavaFX, the Java SE installer, the JInitiator browser plug-in, the native WebLogic proxy plug-in, or a native part of Oracle Application Server or Collaboration Suite (HTTP Server, Web Cache, Internet Directory, mail and calendar servers). Oracle gives these no CPE of their own and names them only in the description.

8 java-client-side not reached Oracle's own risk-matrix note saying the CVE is reached only through untrusted code in the Java sandbox (applets, Web Start) or only through a client installation of Java, so a server running its own trusted code is not exposed

9 osv-maven not reached An OSV.dev record of this CVE affecting a package published to Maven Central. When every such package is one business applications do not use (Minecraft mods and launchers, Fastjson) and no tracked product is named by CPE, it settles the CVE as Outside Waratek scope instead

10 cna-maven-package not reached An affected Maven artifact named by the CNA itself

11 known-cpe-product not reached An NVD CPE naming a product ARMR tracks

12 cna-cpe-product not reached A CPE the CNA published naming a tracked product. Oracle publishes these on advisory day, months before NVD.

13 oracle-advisory-family not reached A tracked product family named in Oracle's own risk matrix. CPE cannot carry a suite name, only a module.

14 cna-named-product not reached A tracked product named in words by the CVE's own CNA, on a record with no CPE yet. Apache and Eclipse publish these on advisory day, before NVD adds CPE data.

15 non-deployable-product not reached The only affected product being a sealed appliance image, where Java runs but no -javaagent can be attached

16 unmatched-product not reached No tracked product matched above, and none present at all

disposition: What do we do about one that is? every rule runs

17 patch-hint not reached A reference pointing at the upstream fix: a commit, a PR, a Red Hat bug

18 open-source-maven not reached The affected package being open source on Maven, so the fix can be read

19 poc-derivable not reached An indexed exploit clearing the evidence bar to reverse-engineer, where there is no source to read

20 no-exploit not reached Nothing to build a rule from yet: no published exploit, no CISA record of exploitation and no source-level change to read

21 secure-rule-match not reached A vulnerability class already blocked by an ARMR security rule

22 exploited-no-fix-or-poc not reached Somebody exploiting this CVE (a CISA or VulnCheck KEV listing, or a CISA verdict of active exploitation), with no fix, source code or PoC to build a rule from

23 below-action-threshold not reached Medium or Low severity, no CISA or VulnCheck KEV listing, no PoC clearing the evidence bar, no CISA verdict, no Oracle advisory

24 no-exploit-published not reached Exploit code for this candidate, published in a reviewed catalogue or a GitHub repository with 5 or more stars, or in use per CISA or VulnCheck; not only a CISA verdict, a forecast, or nothing at all

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