CANONICALVERIFIED
USN-8872-1: libxmltok vulnerabilities
Checked 6 Oct 2026. BlackTree preserves the last verified facts if a later source check is temporarily unavailable.
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UBUNTU SECURITY NOTICECANONICALVERIFIED
PUBLISHER UPDATE · USN-8872-1
USN-8872-1 release notes and known issues
USN-8872-1: libxmltok vulnerabilities
Scope: Ubuntu. This update record adds version, fix and known-issue context. Its publication date is not a lifecycle boundary.
Summary
It was discovered that Expat, contained with the xmltok library did not correctly handle certain integer arithmetic. If a user or automated system were tricked into opening a specially crafted file, an attacker could possibly cause a denial of service. (CVE-2026-56404, CVE-2026-56405)
Improvements and security content
- It was discovered that Expat, contained with the xmltok library did not correctly handle certain integer arithmetic. If a user or automated system were tricked into opening a specially crafted file, an attacker could possibly cause a denial of service. (CVE-2026-56404, CVE-2026-56405)
Known issues
Publisher statementNot stated. The verified publisher record does not contain a known-issues statement.
Affected products and versions
Products
- Ubuntu
Affected versions
- See the official publisher source for applicability.
Fixed versions or updates
- No fixed version is stated in this record.
Recommended action
Review the official publisher document before deployment.
Related vulnerabilities
BlackTree CVE IntelligenceLifecycle connections
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