# CVE-2026-6732: Libxml2: libxml2: denial of service via crafted xsd-validated document

CVE-2026-6732 is fixed in 6 products on 1 platform, first by libxml2-16 2.14.5+dfsg-0.2ubuntu0.2, released April 23, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-6732
- Priority: High
- CVSS: 7.5 (Moderate)
- EPSS: 0.0063
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 23, 2026
- Weakness: Access of Resource Using Incompatible Type ('Type Confusion')
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-6732

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libxml2 Debian 14 | 2.15.3+dfsg-1 | [DEBIAN-CVE-2026-6732](https://patchblox.com/security/data/fix/linux/debian-cve-2026-6732.md) | Apr 23, 2026 |
| Linux | libxml2 opensuse-leap 16.0 | 2.13.8-160000.5.1 | [OPENSUSE-SU-2026:21317-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21317-1.md) | Jul 13, 2026 |
| Linux | libxml2 sles 16.0 | 2.13.8-160000.5.1 | [SUSE-SU-2026:22636-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22636-1.md) | Jul 13, 2026 |
| Linux | libxml2-16 Ubuntu 25.10 (questing) | 2.14.5+dfsg-0.2ubuntu0.2 | [libxml2-16 2.14.5+dfsg-0.2ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libxml2-16-2.14.5-dfsg-0.2ubuntu0.2.md) | Apr 23, 2026 |
| Linux | libxml2-16 Ubuntu 26.04.1 LTS (resolute) | 2.15.2+dfsg-0.1ubuntu0.1 | [libxml2-16 2.15.2+dfsg-0.1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libxml2-16-2.15.2-dfsg-0.1ubuntu0.1.md) | Apr 23, 2026 |
| Linux | libxml2-python opensuse-leap 16.0 | 2.13.8-160000.5.1 | [OPENSUSE-SU-2026:21317-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21317-1.md) | Jul 13, 2026 |
| Linux | libxml2-python sles 16.0 | 2.13.8-160000.5.1 | [SUSE-SU-2026:22636-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22636-1.md) | Jul 13, 2026 |
| Linux | libxml2-source Ubuntu 26.04.1 LTS (resolute) | 2.15.2+dfsg-0.1ubuntu0.1 | [libxml2-source 2.15.2+dfsg-0.1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libxml2-source-2.15.2-dfsg-0.1ubuntu0.1.md) | Apr 23, 2026 |
| Linux | libxml2-utils Ubuntu 25.10 (questing) | 2.14.5+dfsg-0.2ubuntu0.2 | [libxml2-utils 2.14.5+dfsg-0.2ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libxml2-utils-2.14.5-dfsg-0.2ubuntu0.2.md) | Apr 23, 2026 |
| Linux | libxml2-utils Ubuntu 26.04.1 LTS (resolute) | 2.15.2+dfsg-0.1ubuntu0.1 | [libxml2-utils 2.15.2+dfsg-0.1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libxml2-utils-2.15.2-dfsg-0.1ubuntu0.1.md) | Apr 23, 2026 |
| Linux | python3-libxml2 Ubuntu 25.10 (questing) | 2.14.5+dfsg-0.2ubuntu0.2 | [python3-libxml2 2.14.5+dfsg-0.2ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-questing-python3-libxml2-2.14.5-dfsg-0.2ubuntu0.2.md) | Apr 23, 2026 |
| Linux | python3-libxml2 Ubuntu 26.04.1 LTS (resolute) | 2.15.2+dfsg-0.1ubuntu0.1 | [python3-libxml2 2.15.2+dfsg-0.1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-python3-libxml2-2.15.2-dfsg-0.1ubuntu0.1.md) | Apr 23, 2026 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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