CVE-2026-4893

CVSS 5.3 MEDIUMEPSS 2.7%

Vexday Risk Score

33Attention

SSVC decision (CISA)

Attend

PoC available → attend closely

CVSS 5.3EPSS 2.7%KEV nãoPoC públicaNuclei —Metasploit —Patch —

Lifecycle

11 May 2026Published on NVD

27 May 2026Public PoC

Recommendation: Plan a near-term fix — a public PoC already exists.

An information disclosure vulnerability in dnsmasq allows remote attackers to bypass source checks via a crafted DNS packet with RFC 7871 client subnet information.

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

Affected products

dnsmasq · dnsmasq

public PoCs found — 1

githubgithub.com/lottiedeyan/CVE20264893poc★ 0

⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.

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References

https://github.com/NixOS/nixpkgs/pull/519082 https://github.com/NixOS/nixpkgs/pull/519093 https://github.com/pi-hole/FTL/releases/tag/v6.6.2 https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html https://thekelleys.org.uk/dnsmasq/CVE/https://www.kb.cert.org/vuls/id/471747