AlmaLinux alert ALSA-2026:20589 (dnsmasq)

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[Announce]  [Security Advisory] ALSA-2026:20589: dnsmasq security update (Important)
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Tue, 26 May 2026 16:06:10 +0000
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<0100019e650951dd-09154b54-2649-4172-8a57-c4ddb8e7fe39-000000@email.amazonses.com>
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Article
Hi,

You are receiving an AlmaLinux Security update email because you subscribed to receive errata
notifications from AlmaLinux.

AlmaLinux: 8
Type: Security
Severity: Important
Release date: 2026-05-26

Summary:

The dnsmasq packages contain Dnsmasq, a lightweight DNS (Domain Name Server) forwarder and DHCP
(Dynamic Host Configuration Protocol) server.  

Security Fix(es):  

  * dnsmasq: dnsmasq: heap buffer overflow in cache via NAME_ESCAPE expansion (CVE-2026-2291)
  * dnsmasq: NSEC bitmap parsing infinite loop (CVE-2026-4890)
  * dnsmasq: RRSIG rdlen underflow leading to heap OOB read (CVE-2026-4891)
  * dnsmasq: DHCPv6 CLID buffer overflow in helper process (CVE-2026-4892)
  * dnsmasq: Broken ECS source validation bypass (CVE-2026-4893)


For more details about the security issue(s), including the impact, a CVSS score, acknowledgments,
and other related information, refer to the CVE page(s) listed in the References section.


Full details, updated packages, references, and other related information:
https://errata.almalinux.org/8/ALSA-2026-20589.html

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AlmaLinux Team
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