CVE-2026-32327

Apache Portable Runtime Utility: apr-util XML stack recursion crash

Published Aug 6, 2026 CVSS 3.1 · 9.1 Critical EPSS < 1% KEV · Not listed
Description
A bug in APR-util version 1.6.3 (and earlier) allows a stack recursion attack against any library consumer which parses XML from untrusted sources and uses the apr_xml_quote_elem() function.

Users are recommended to upgrade to version 1.6.4, which fixes this issue.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DLA Debian DLA DLA-4742-1 apr-util security update
Debian DSA Debian DSA DSA-6437-1 apr-util security update
Ubuntu USN Ubuntu USN USN-8719-1 APR-util vulnerabilities
History
Type Values Removed Values Added
Metrics cvssV3_1

{'score': 9.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Apache
Apache portable Runtime Utility
Vendors & Products Apache
Apache portable Runtime Utility
Type Values Removed Values Added
Description A bug in APR-util version 1.6.3 (and earlier) allows a stack recursion attack against any library consumer which parses XML from untrusted sources and uses the apr_xml_quote_elem() function. Users are recommended to upgrade to version 1.6.4, which fixes this issue.
Title Apache Portable Runtime Utility: apr-util XML stack recursion crash
Weaknesses CWE-674
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
apache
Published
Updated
Aug 6, 2026, 9:56 PM
Reserved
Mar 12, 2026, 8:57 AM
Status
Analyzed
Published
Aug 6, 2026, 3:16 PM
Modified
Oct 24, 2026, 4:10 PM
Severity
Moderate
Public date
Aug 6, 2026, 2:32 PM