Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion') Affecting apr-util-devel package, versions <0:1.6.5-1.amzn2023.0.1


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.46% (38th percentile)

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  • Snyk IDSNYK-AMZN2023-APRUTILDEVEL-19475780
  • published1 Sept 2026
  • disclosed6 Aug 2026

Introduced: 6 Aug 2026

CVE-2026-32327  (opens in a new tab)
CWE-776  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 apr-util-devel to version 0:1.6.5-1.amzn2023.0.1 or higher.
This issue was patched in ALAS2023-2026-2115.

NVD Description

Note: Versions mentioned in the description apply only to the upstream apr-util-devel package and not the apr-util-devel package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.

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 Base Scores

version 3.1