Use After Free Affecting curl package, versions <0:8.21.0-5.amzn2023.0.4


Severity

Recommended
medium

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.58% (46th percentile)

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  • Snyk IDSNYK-AMZN2023-CURL-22397312
  • published10 Nov 2026
  • disclosed6 Sept 2026

Introduced: 6 Sep 2026

CVE-2026-18924  (opens in a new tab)
CWE-416  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 curl to version 0:8.21.0-5.amzn2023.0.4 or higher.
This issue was patched in ALAS2023-2026-3404.

NVD Description

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

A flaw in libcurl's handling of HTTP/2 Server Push streams, when the parent handle is set to share connections with other handles, can lead to use-after-free in the cleanup process.

CVSS Base Scores

version 3.1