What is CVE-2026-32327?

CVE-2026-32327 is a critical-severity vulnerability in Apache Apr-Util, classified under Uncontrolled Recursion. CVSS score: 9.1/10. Published 2026-08-06.

How severe is CVE-2026-32327?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Vulnerability in Apache Apr-Util

CVE-2026-32327

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.

Published 2026-08-06 · last modified 2026-10-24.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.

EPSS exploit prediction

EPSS: 0.005 (39.8th percentile), scored 2026-11-04.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 39.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Apache Apr-Util
Apache Software Foundation Portable Runtime Utility — versions 0

Weakness classification (CWE)

CWE-674 — Uncontrolled Recursion

References

lists.apache.org/thread/hq27vj8yfno9tkwv0fpj6jksfzgxvth1 (vendor-advisory, Mailing List, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2026-32327?: CVE-2026-32327 is a critical-severity vulnerability in Apache Apr-Util, classified under Uncontrolled Recursion. CVSS score: 9.1/10. Published 2026-08-06.
How severe is CVE-2026-32327?: Critical severity. CVSS v3 base score is 9.1 out of 10.