Integer Overflow or Wraparound Affecting expat package, versions <0:2.8.3-1.amzn2023.0.1


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.12% (2nd percentile)

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  • Snyk IDSNYK-AMZN2023-EXPAT-19820360
  • published15 Sept 2026
  • disclosed21 Jun 2026

Introduced: 21 Jun 2026

CVE-2026-56409  (opens in a new tab)
CWE-190  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 expat to version 0:2.8.3-1.amzn2023.0.1 or higher.
This issue was patched in ALAS2023-2026-2157.

NVD Description

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

xmlwf in libexpat before 2.8.2 has an integer overflow for the output filename when -d outputDir is used.

CVSS Base Scores

version 3.1