Improper Handling of Unicode Encoding Affecting mingw32-expat package, versions *


Severity

Recommended
0.0
high
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.4% (33rd percentile)

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  • Snyk IDSNYK-RHEL8-MINGW32EXPAT-20161833
  • published27 Sept 2026
  • disclosed19 Sept 2026

Introduced: 19 Sep 2026

NewCVE-2026-93990  (opens in a new tab)
CWE-176  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:8 mingw32-expat.

NVD Description

Note: Versions mentioned in the description apply only to the upstream mingw32-expat package and not the mingw32-expat package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

Expat before 2.8.5 fails to validate that a high surrogate in UTF-16 input is followed by a low surrogate, allowing malformed UTF-16 sequences to be accepted. Attackers can supply UTF-16 encoded XML containing lone high surrogates that consume the following code unit, causing Expat to pass unpaired surrogates to applications built with XML_UNICODE and to silently replace input characters in other builds.

CVSS Base Scores

version 3.1