RLSA-2026:20589
- Source
- https://errata.rockylinux.org/RLSA-2026:20589
- Import Source
- https://storage.googleapis.com/resf-osv-data/RLSA-2026:20589.json
- JSON Data
- https://api.osv.dev/v1/vulns/RLSA-2026:20589
- Upstream
- Published
- 2026-05-29T00:00:29.215827Z
- Modified
- 2026-05-29T00:30:04.780203744Z
- Severity
-
- 8.8 (High) CVSS_V3 - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- Important: dnsmasq security update
- Details
-
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.
- References
-
- https://errata.rockylinux.org/RLSA-2026:20589
- https://bugzilla.redhat.com/show_bug.cgi?id=2439088
- https://bugzilla.redhat.com/show_bug.cgi?id=2458516
- https://bugzilla.redhat.com/show_bug.cgi?id=2458517
- https://bugzilla.redhat.com/show_bug.cgi?id=2458518
- https://bugzilla.redhat.com/show_bug.cgi?id=2458519
- Credits
-
-
- Rocky Enterprise Software Foundation
-
- Red Hat
-
Affected packages
Rocky Linux:8 / dnsmasq
Package
- Name
- dnsmasq
- Purl
- pkg:rpm/rocky-linux/dnsmasq?distro=rocky-linux-8&epoch=0