GHSA-xvg2-cgv6-6h7v: github.com/tinfoil-factory/netfoil

Package	Ecosystem	Affected	Fixed in
github.com/tinfoil-factory/netfoil	Go	<0.4.0	0.4.0

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

netfoil, a Go package, is vulnerable in versions before 0.4.0. Blocked DNS queries received a 0.0.0.0 answer instead of NXDOMAIN, so on Linux the traffic meant for a blocked destination was sent to localhost rather than dropped. The impact depends on which services are running locally and on firewall rules; the source gives few other details. Upgrade to version 0.4.0 or later.

Written 6 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
Not published	None	4.0	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N	GitHub Advisory Database

CISA KEV Not listed.
EPSS No score.

Timeline

31 Oct 2026, 14:50 UTC First seen by agentprime
31 Oct 2026, 14:50 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.