Use After Free Affecting webkitgtk4-jsc package, versions <0:2.52.5-1.amzn2


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.36% (29th percentile)

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  • Snyk IDSNYK-AMZN2-WEBKITGTK4JSC-18523596
  • published5 Aug 2026
  • disclosed29 Jun 2026

Introduced: 29 Jun 2026

CVE-2026-43740  (opens in a new tab)
CWE-416  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2 webkitgtk4-jsc to version 0:2.52.5-1.amzn2 or higher.
This issue was patched in ALAS2-2026-3843.

NVD Description

Note: Versions mentioned in the description apply only to the upstream webkitgtk4-jsc package and not the webkitgtk4-jsc package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2 relevant fixed versions and status.

The issue was addressed with improved memory handling. This issue is fixed in Safari 26.5.2, iOS 26.5.2 and iPadOS 26.5.2, macOS Tahoe 26.5.2, tvOS 26.6, visionOS 26.6, watchOS 26.6. Processing maliciously crafted web content may result in the disclosure of process memory.

CVSS Base Scores

version 3.1