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CVE-2026-6732· NVD / CVE Program· CNA redhat

Libxml2: libxml2: denial of service via crafted xsd-validated document

Noroxi assessment

Priority: Monitor (action score 30/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.63% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: libxml2 (Alpine:v3.21) 2.13.9-r1; libxml2 (Alpine:v3.24) 2.13.9-r2; libxml2 (Debian:14) 2.15.3+dfsg-1.

Low priority for now. Upgrade to libxml2 (Alpine:v3.21) 2.13.9-r1; libxml2 (Alpine:v3.24) 2.13.9-r2; libxml2 (Debian:14) 2.15.3+dfsg-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

A flaw was found in libxml2. This vulnerability occurs when the library processes a specially crafted XML Schema Definition (XSD) validated document that includes an internal entity reference. An attacker could exploit this by providing a malicious document, leading to a type confusion error that causes the application to crash. This results in a denial of service (DoS), making the affected system or application unavailable.

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Apr 23, 2026
Updated
Aug 31, 2026
EPSS
0.6% · 49th percentile

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.6%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
7.5
CNA · redhat
6.5
1.0 point gap

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-6732

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
xmlsoftlibxml2
redhathardened images
redhatjboss core services
redhatopenshift container platform
redhatenterprise linux
ibmvios
ibmaix

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • ibm aix7.3.2 and later · before 7.3.3.3
  • ibm aix7.2.5 and later · before 7.2.5.12
  • ibm aix7.3.4
  • ibm vios4.1.0 and later · before 4.1.1.30
  • ibm vios4.1.2.0
  • redhat enterprise linux10.0
  • redhat enterprise linux6.0
  • redhat enterprise linux7.0
  • redhat enterprise linux8.0
  • redhat enterprise linux9.0
  • redhat hardened imagesall versions
  • redhat jboss core servicesall versions
  • redhat openshift container platform4.0
  • xmlsoft libxml22.13.0 and later · before 2.15.3

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • Red Hat Red Hat Enterprise Linux 10

    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 6

    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 7

    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 8

    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 9

    • all versionsunknown

  • Red Hat Red Hat Hardened Images

    • 2.15.3-0.1.hum1 and laternot affected · rpm

  • Red Hat Red Hat JBoss Core Services

    • all versionsaffected

  • Red Hat Red Hat OpenShift Container Platform 4

    • all versionsunknown
    • all versionsunknown

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Alpine:v3.21libxml2from 2.13.0 · before 2.13.9-r12.13.9-r1
Alpine:v3.24libxml2from 2.13.0 · before 2.13.9-r22.13.9-r2
Debian:14libxml2before 2.15.3+dfsg-12.15.3+dfsg-1
openSUSE:Leap 16.0libxml2before 2.13.8-160000.5.12.13.8-160000.5.1
openSUSE:Leap 16.0libxml2-pythonbefore 2.13.8-160000.5.12.13.8-160000.5.1
Red Hat:hummingbird:1libxml2before 0:2.15.3-0.1.hum10:2.15.3-0.1.hum1
Red Hat:hummingbird:1libxml2-16before 0:2.15.3-0.1.hum10:2.15.3-0.1.hum1
Red Hat:hummingbird:1libxml2-develbefore 0:2.15.3-0.1.hum10:2.15.3-0.1.hum1
Red Hat:hummingbird:1libxml2-staticbefore 0:2.15.3-0.1.hum10:2.15.3-0.1.hum1
Red Hat:hummingbird:1python3-libxml2before 0:2.15.3-0.1.hum10:2.15.3-0.1.hum1
SUSE:Linux Micro 6.2libxml2before 2.13.8-160000.5.12.13.8-160000.5.1
SUSE:Linux Micro 6.2libxml2-pythonbefore 2.13.8-160000.5.12.13.8-160000.5.1

Same product

xmlsoft: all records

Other highest-scoring records for the same primary product.

  • CVE-2008-3529Heap-based buffer overflow in the xmlParseAttValueComplex function in parser.c in libxml2 before 2.7.0 allows context-dependent attackers to
    47Plan
  • CVE-2017-7376Buffer overflow in libxml2 allows remote attackers to execute arbitrary code by leveraging an incorrect limit for port values when handling
    46Plan
  • CVE-2022-40303An issue was discovered in libxml2 before 2.10.3.
    42Plan

Published before and after this one in the same product

  • ← EarlierCVE-2025-9714Sep 10, 2025 · Stack overflow in libxml2
    22Monitor
  • ← EarlierCVE-2026-0989Jan 15, 2026 · Libxml2: unbounded relaxng include recursion leading to stack overflow
    14Monitor
  • Later →CVE-2026-6653Jun 22, 2026 · libxml2: Use after free in xmlParseInternalSubset via improper entity resolution handling
    28Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
alpine:libxml22.13.9-r1 · Alpine:v3.21Package registry (OSV)
debian:libxml22.15.3+dfsg-1 · Debian:14Package registry (OSV)
opensuse:libxml22.13.8-160000.5.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:libxml2-python2.13.8-160000.5.1 · openSUSE:Leap 16.0Package registry (OSV)
red hat:libxml20:2.15.3-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:libxml2-160:2.15.3-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:libxml2-devel0:2.15.3-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:libxml2-static0:2.15.3-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:python3-libxml20:2.15.3-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
suse:libxml22.13.8-160000.5.1 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:libxml2-python2.13.8-160000.5.1 · SUSE:Linux Micro 6.2Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-843 · Access of Resource Using Incompatible Type ('Type Confusion')

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (3 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records