LIVE · cybersecurity feed
Live wire
ASOS Breach Reveals the Risks in Customer-Facing SaaSUnpatched AhsayCBS flaws exploited to deploy webshells, mine cryptoAI Training Critical as Governance Challenges GrowUS Disrupts Chinese State-Sponsored Hacking ToolsCitrix warns admins to patch new NetScaler RCE flaw immediatelyCisco Patches a Dozen Critical VulnerabilitiesCisco warns of critical flaws allowing Nexus switch takeoverCVE-2026-21589 · Exploitation attempts against critical Atlassian flaw have begun (CVE-2026-21589)Cyber experts call on CISA to create mandatory federal OT rulesGremlin Foresight AI finds system weaknesses and verifies the fixes
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

← Back to the CVE Tracker

Our coverage of CVE-2026-4890

CVE-2026-4890high

Dnsmasq DNSSEC Vulnerability Leads to Denial-of-Service

A critical denial-of-service vulnerability, identified as CVE-2026-4890, has been disclosed in Dnsmasq, a widely used DNS forwarder and DHCP server. The flaw, which received a CVSS score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H), allows remote attackers to trigger an infinite loop by sending specially crafted DNSSEC NSEC/NSEC3 records, leading to a denial-of-service condition.