CVE-2026-4893

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Summary

CVECVE-2026-4893
StatePUBLISHED
Assignercertcc
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-11 18:16:41 UTC
Updated2026-05-12 14:15:46 UTC
DescriptionAn information disclosure vulnerability in dnsmasq allows remote attackers to bypass source checks via a crafted DNS packet with RFC 7871 client subnet information.

Risk And Classification

Primary CVSS: v3.1 5.3 MEDIUM from ADP

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

EPSS: 0.000490000 probability, percentile 0.152870000 (date 2026-05-12)

Problem Types: CWE-287: Improper Authentication

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Dnsmasq Dnsmasq affected 2.92rel2 Not specified

References

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