GHSA-59qp-cfj3-rp64 netfoil has a domain name filter bypass via multiple questions
Attackers can bypass domain name filters in the netfoil Go library by crafting DNS requests with multiple questions, potentially evading security controls.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is GHSA-59qp-cfj3-rp64?
GHSA-59qp-cfj3-rp64 is a vulnerability in github.com/tinfoil-factory/netfoil, published on 7 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Summary
Potential bypass of domain name filter by crafting a DNS request with multiple questions, with the first question being legitimate.
Impact
Depends on a local attackers ability to craft multiple questions and the remote DoH server supporting them.
Which versions are affected by GHSA-59qp-cfj3-rp64?
3 open source packages ship an affected version, including github.com/tinfoil-factory/netfoil.
| Package | Affected | Fixed in |
|---|---|---|
github.com/tinfoil-factory/netfoil Go | All versions | 0.3.0 |
github.com/tinfoil-factory/netfoil Go | All versions | 0.3.0 |
github.com/tinfoil-factory/netfoil Go | All versions | 0.3.0 |
How do I fix GHSA-59qp-cfj3-rp64?
Upgrade github.com/tinfoil-factory/netfoil to 0.3.0 or later.
Is GHSA-59qp-cfj3-rp64 being exploited?
There is no known exploitation of GHSA-59qp-cfj3-rp64 in the wild and no public exploit code.
Sources
Also known as GO-2026-5934.