Amazon Linux 2 Security Advisory: ALAS2-2026-3807
Advisory Released Date: 2026-07-20
Advisory Updated Date: 2026-07-20
Severity:
Important
Issue Overview:
Uncontrolled Resource Consumption vulnerability in the HTTP/1.1 message parser in Apache HttpComponents Core (5.4.2 and earlier, 5.5-beta1 and earlier) allows an remote attacker to cause a denial of service through memory exhaustion by sending messages with excessive number of headers / excessive header length (CVE-2026-54399)
Affected Packages:
httpcomponents-core
Note:
This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.
Issue Correction:
Run yum update httpcomponents-core or yum update --advisory ALAS2-2026-3807 to update your system.
New Packages:
noarch:
httpcomponents-core-4.2.4-6.amzn2.0.1.noarch
httpcomponents-core-javadoc-4.2.4-6.amzn2.0.1.noarch
src:
httpcomponents-core-4.2.4-6.amzn2.0.1.src