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cve recordhigh

CVE-2026-4890

Published
CVSS7.5
Severityhigh
WeaknessCWE-835
ExploitedNot in CISA KEV

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

References

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Our coverage of CVE-2026-4890

CVE-2026-4890high

Dnsmasq DNSSEC Vulnerability Leads to Denial-of-Service

A vulnerability in dnsmasq's DNSSEC NSEC/NSEC3 type bitmap processing can allow remote attackers to cause a denial-of-service condition. Exploitation does not require authentication. The vulnerability has a CVSS score of 7.5.