3.7Low
Xmlsoft Libxml2
CVE-2026-0989
A flaw was identified in the RelaxNG parser of libxml2 related to how external schema inclusions are handled. The parser does not enforce a limit on inclusion depth when resolving nested directives. Specially crafted or overly complex schemas can cause excessive recursion during parsing. This may lead to stack exhaustion and application crashes, creating a denial-of-service risk.
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 remotely, over a network, without a login, and without anyone at your company clicking anything.
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.
Not sure if your company is exposed?
Fastnexa’s certified penetration testers can check whether attackers could use this flaw, or others like it, against your websites, apps and network. The full test is free for our first 10 founding clients until 31 December 2026.
Scoring
- CVSS
- 3.7 (v3.1)
- Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L- Weakness
- CWE-674
- Assigned by
- secalert@redhat.com
Dates
- Published
- 2026-01-15
- Last modified
- 2026-09-01
- Sources
- NVD
Affected products
- Xmlsoft Libxml2- 2.15.2
- 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.