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High severity · published May 11, 2026
CVE-2026-4890
No description published yet
7.5
CVSS
8.8%
EPSS
No
On KEV
Description
A Denial of Service (DoS) vulnerability in the DNSSEC validation of dnsmasq allows remote attackers to cause a denial of service via a crafted DNS packet.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)8.8% · higher than 95% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DN
dnsmasq · dnsmasq
before 2.92rel2 · source: vendor
RH
Red Hat Enterprise Linux 10 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Enterprise Linux 6 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Enterprise Linux 7 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Enterprise Linux 8 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Enterprise Linux 9 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Enterprise Linux 9.6 Extended Update Support · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat OpenShift Container Platform 4.19 · Red Hat
All versions, or not specified · source: CISA
In the news
VulnerabilityHigh
ZDI-26-584: dnsmasq DNSSEC NSEC/NSEC3 Type Bitmap Processing Infinite Loop Denial-of-Service Vulnerability
This vulnerability allows remote attackers to create a denial-of-service condition on affected installations of dnsmasq. Authentication is not required to exploit this vulnerability. The ZDI has assigned a CVSS rating of 7.5. The following CVEs are assigned: CVE-2026-4890.
CVE-2026-4890
Aug 13, 2026·Zero Day Initiative
Affected product
DN
dnsmasq
dnsmasq
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-4890
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-4890
github.com
https://github.com/NixOS/nixpkgs/pull/519082
github.com
https://github.com/NixOS/nixpkgs/pull/519093
github.com
https://github.com/pi-hole/FTL/releases/tag/v6.6.2
lists.thekelleys.org.uk
https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html
thekelleys.org.uk
https://thekelleys.org.uk/dnsmasq/CVE/
www.kb.cert.org
https://www.kb.cert.org/vuls/id/471747
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