Vulnerability in Dnsmasq

CVE-2026-4893

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

Published · last modified .

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.006 (45.4th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 45.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-4893: fell from 0.018 to 0.006.

EPSS over last 30 days · oldest: 0.018 · newest: 0.006 · change: -0.012

Affected products

  • Dnsmasq — versions 0, 2.93, 2.92rel2

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2026-4893?
CVE-2026-4893 is a medium-severity vulnerability in Dnsmasq, classified under CWE-287: IMPROPER AUTHENTICATION. CVSS score: 5.3/10. Published 2026-05-11.
How severe is CVE-2026-4893?
Medium severity. CVSS v3 base score is 5.3 out of 10.
Is CVE-2026-4893 known to be exploited?
1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.