Amazon Linux 2 Security Advisory: ALAS2DNSMASQ-2026-003
Advisory Released Date: 2026-05-14
Advisory Updated Date: 2026-06-08
Severity:
Important
Issue Overview:
dnsmasqs extract_name() function can be abused to cause a heap buffer overflow, allowing an attacker to inject false DNS cache entries, which could result in DNS lookups to redirect to an attacker-controlled IP address, or to cause a DoS. (CVE-2026-2291)
Affected Packages:
dnsmasq
Note:
This advisory is applicable to Amazon Linux 2 - Dnsmasq Extra. Visit this page to learn more about Amazon Linux 2 (AL2) Extras and this FAQ section for the difference between AL2 Core and AL2 Extras advisories.
Issue Correction:
Run yum update dnsmasq or yum update --advisory ALAS2DNSMASQ-2026-003 to update your system.
New Packages:
aarch64:
dnsmasq-2.90-1.amzn2.0.2.aarch64
dnsmasq-utils-2.90-1.amzn2.0.2.aarch64
dnsmasq-debuginfo-2.90-1.amzn2.0.2.aarch64
src:
dnsmasq-2.90-1.amzn2.0.2.src
x86_64:
dnsmasq-2.90-1.amzn2.0.2.x86_64
dnsmasq-utils-2.90-1.amzn2.0.2.x86_64
dnsmasq-debuginfo-2.90-1.amzn2.0.2.x86_64
Changelog:
2026-06-08: CVE-2026-2291 was added to this advisory.