CVE-2026-4890

HIGHNVD 7.57.5—

7.5

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 v3: 7.5
EG Score: 7.5(high)
EPSS: 47.1%
KEV: Not listed

Published

May 11, 2026

Last Modified

May 12, 2026

Advisory Details (5)

Auto-updated May 11, 2026

No patch confirmed yet. Sources: cert.

cert

VU#471747 - dnsmasq contains several vulnerabilities, including attacker DNS redirect, privilege escalation, and heap manipulation

https://www.kb.cert.org/vuls/id/471747

generic

Index of /dnsmasq/CVE

https://thekelleys.org.uk/dnsmasq/CVE/

generic

[Dnsmasq-discuss] Security - IMPORTANT

https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html

generic

[Backport release-25.11] dnsmasq: 2.92 -> 2.92rel2 by LeSuisse · Pull Request #519093 · NixOS/nixpkgs · GitHub

https://github.com/NixOS/nixpkgs/pull/519093

generic

dnsmasq: 2.92 -> 2.92rel2 by LeSuisse · Pull Request #519082 · NixOS/nixpkgs · GitHub

https://github.com/NixOS/nixpkgs/pull/519082

Vendor Advisories for CVE-2026-4890(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

CVE-2026-4890
Microsoft Security Response Center (MSRC)
CVE-2026-4890

Frequently asked(5)

What is CVE-2026-4890?

CVE-2026-4890 is a high vulnerability published on May 11, 2026. 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.

When was CVE-2026-4890 disclosed?

CVE-2026-4890 was first published in the National Vulnerability Database on May 11, 2026, with the most recent update on May 12, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2026-4890 actively exploited?

CVE-2026-4890 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 47.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-4890?

CVE-2026-4890 has a CVSS v3 base score of 7.5 (NVD).

How do I remediate CVE-2026-4890?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-4890, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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CVE-2026-4890

📅 Published

🔄 Last Modified

📋 Advisory Details (5)

VU#471747 - dnsmasq contains several vulnerabilities, including attacker DNS redirect, privilege escalation, and heap manipulation

Index of /dnsmasq/CVE

[Dnsmasq-discuss] Security - IMPORTANT

[Backport release-25.11] dnsmasq: 2.92 -> 2.92rel2 by LeSuisse · Pull Request #519093 · NixOS/nixpkgs · GitHub

dnsmasq: 2.92 -> 2.92rel2 by LeSuisse · Pull Request #519082 · NixOS/nixpkgs · GitHub

📣 Vendor Advisories for CVE-2026-4890(1)

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2026-4890?

🔗 Related CVEs(same product + same vendor)

Same vendor

Published

Last Modified

Advisory Details (5)

Vendor Advisories for CVE-2026-4890(1)

Frequently asked(5)

Related CVEs(same product + same vendor)