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dnsmasq: RRSIG rdlen underflow leading to heap OOB read

🗓️ 26 May 2026 05:09:20Reported by RedHatType 
redhat
 redhat🔗 access.redhat.com👁 55 Views

dnsmasq DNSSEC validation allows a crafted RRSIG to underflow the signature length, causing a heap read crash.

Related
Packages
Refs
ReporterTitlePublishedViews
Family
attackerkb
attackerkb		CVE-2026-4891
11 May 202616:47
–attackerkb
nessus
Tenable Nessus		Amazon Linux 2023 : dnsmasq, dnsmasq-utils (ALAS2023-2026-1729)
26 May 202600:00
–nessus
nessus
Tenable Nessus		Amazon Linux 2 : dnsmasq, --advisory ALAS2DNSMASQ-2026-004 (ALASDNSMASQ-2026-004)
27 May 202600:00
–nessus
nessus
Tenable Nessus		AlmaLinux 8 : dnsmasq (ALSA-2026:20589)
27 May 202600:00
–nessus
nessus
Tenable Nessus		CentOS Linux 7.9 [CIQ] Security Update: dnsmasq / dnsmasq-debuginfo / dnsmasq-utils Multiple Vulnerabilities (ciqsa-2026_1468)
1 Oct 202600:00
–nessus
nessus
Tenable Nessus		Rocky Linux 10.2 [CIQ] Security Update: dnsmasq / dnsmasq-debuginfo / dnsmasq-debugsource / dnsmasq-utils / etc Multiple Vulnerabilities (crlsa-2026_19158)
1 Oct 202600:00
–nessus
nessus
Tenable Nessus		Rocky Linux 8.6 [CIQ] Security Update: dnsmasq / dnsmasq-debuginfo / dnsmasq-debugsource / dnsmasq-utils / etc Multiple Vulnerabilities (ciqsa-2026_1467)
1 Oct 202600:00
–nessus
nessus
Tenable Nessus		Rocky Linux 8 [CIQ] Security Update: dnsmasq / dnsmasq-debuginfo / dnsmasq-debugsource / dnsmasq-utils / etc Multiple Vulnerabilities (crlsa-2026_20589)
1 Oct 202600:00
–nessus
nessus
Tenable Nessus		Rocky Linux 9.4 [CIQ] Security Update: dnsmasq / dnsmasq-debuginfo / dnsmasq-debugsource / dnsmasq-utils / etc Multiple Vulnerabilities (ciqsa-2026_1387)
1 Oct 202600:00
–nessus
nessus
Tenable Nessus		Rocky Linux 9.6 [CIQ] Security Update: dnsmasq / dnsmasq-debuginfo / dnsmasq-debugsource / dnsmasq-utils / etc Multiple Vulnerabilities (ciqsa-2026_1352)
1 Oct 202600:00
–nessus
Rows per page
OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux8.10aarch64dnsmasq2.79-36.el8_10dnsmasq-2.79-36.el8_10.aarch64.rpm
Red Hat Enterprise Linux8.10ppc64lednsmasq2.79-36.el8_10dnsmasq-2.79-36.el8_10.ppc64le.rpm
Red Hat Enterprise Linux8.10s390xdnsmasq2.79-36.el8_10dnsmasq-2.79-36.el8_10.s390x.rpm
Red Hat Enterprise Linux8.10x86_64dnsmasq2.79-36.el8_10dnsmasq-2.79-36.el8_10.x86_64.rpm
Red Hat Enterprise Linux8.10aarch64dnsmasq-debuginfo2.79-36.el8_10dnsmasq-debuginfo-2.79-36.el8_10.aarch64.rpm
Red Hat Enterprise Linux8.10ppc64lednsmasq-debuginfo2.79-36.el8_10dnsmasq-debuginfo-2.79-36.el8_10.ppc64le.rpm
Red Hat Enterprise Linux8.10s390xdnsmasq-debuginfo2.79-36.el8_10dnsmasq-debuginfo-2.79-36.el8_10.s390x.rpm
Red Hat Enterprise Linux8.10x86_64dnsmasq-debuginfo2.79-36.el8_10dnsmasq-debuginfo-2.79-36.el8_10.x86_64.rpm
Red Hat Enterprise Linux8.10aarch64dnsmasq-debugsource2.79-36.el8_10dnsmasq-debugsource-2.79-36.el8_10.aarch64.rpm
Red Hat Enterprise Linux8.10ppc64lednsmasq-debugsource2.79-36.el8_10dnsmasq-debugsource-2.79-36.el8_10.ppc64le.rpm
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09 Oct 2026 23:25Current
7.3High risk
Vulners AI Score7.3
CVSS 3.17.5
EPSS0.00836
SSVC
CWE-125
dnsmasqdnssec validationsignature recordheap crashcrafted record
55