Critical severity · published Aug 6, 2026
CVE-2026-32327
Apache Portable Runtime Utility: apr-util XML stack recursion crash
9.1
CVSS
0.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 40% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AP
Apache Portable Runtime Utility · Apache Software Foundation
through 1.6.3 · source: vendor
AP
Apr-util · Apache
before 1.6.4 · source: NVD
Affected product
AP
Apache Portable Runtime Utility
Apache Software Foundation
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-32327
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-32327
Mailing List
https://lists.apache.org/thread/hq27vj8yfno9tkwv0fpj6jksfzgxvth1
Mailing List
http://www.openwall.com/lists/oss-security/2026/08/06/9
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