Xmlsoft Libxml2
CVE-2026-6732
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.
What this means for your business
- It affects Xmlsoft Libxml2. It matters if your company, or a supplier that handles your data, runs it.
- Code showing how to exploit it has been published, but real attacks have not been confirmed.
- An attacker can use it from inside the same network, without a login, and without anyone at your company clicking anything.
- FIRST's prediction model gives it a 0.6% chance of attack attempts being seen in the next 30 days, ranking above 48% of all known flaws.
What to do
- 1Check whether your company or your suppliers run Xmlsoft Libxml2, and which version. The affected versions are listed further down this page.
- 2If you do, follow the vendor's guidance. No patch reference has been published yet.
Fastnexa security experts
Not sure if your company is exposed to CVE-2026-6732?
Tell us where you run Xmlsoft Libxml2 and a Fastnexa penetration tester will check whether this flaw, or others like it, can be used against your websites, apps and network.
The full test is free for our first 10 founding clients until 31 December 2026. See the offer
Think you’ve already been hit? Don’t wait on a form: call or WhatsApp +1 (732) 454 2616. We reply within 1 hour, 24/7. Emergency help →
Scoring
- CVSS
- 6.5 (v3.1)
- Vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- Weakness
- CWE-843
- Assigned by
- secalert@redhat.com
Dates
- Published
- 2026-04-23
- Last modified
- 2026-08-31
- Sources
- NVD
Affected products
- Xmlsoft Libxml22.13.0 - 2.15.3
- Redhat Hardened Imagesall versions
- Redhat Jboss Core Servicesall versions
- Redhat Openshift Container Platform4.0
- Redhat Enterprise Linux6.0, 7.0, 8.0, 9.0, 10.0
- Ibm Vios4.1.0 - 4.1.1.30, 4.1.2.0
- Ibm Aix7.2.5 - 7.2.5.12, 7.3.2 - 7.3.3.3, 7.3.4
As listed in the NVD configuration data. Not a statement about your estate.