Incorrect Synchronization Affecting expat package, versions <2.8.2-r0


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

Social Trends
EPSS
0.14% (3rd percentile)

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  • Snyk IDSNYK-ALPINE323-EXPAT-17675124
  • published29 Jun 2026
  • disclosed19 Jun 2026

Introduced: 19 Jun 2026

CVE-2026-56132  (opens in a new tab)
CWE-821  (opens in a new tab)

How to fix?

Upgrade Alpine:3.23 expat to version 2.8.2-r0 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream expat package and not the expat package as distributed by Alpine. See How to fix? for Alpine:3.23 relevant fixed versions and status.

In libexpat before 2.8.2, there is a heap-based buffer overflow in doProlog in xmlparse.c because scaffold backing array reallocation is mishandled when there is data-structure sharing across parsers.

CVSS Base Scores

version 3.1