GHSA-4ph6-mjv7-3fq6 netfoil vulnerable to improper handling of untrusted DoH response data
An attacker can cause memory exhaustion or leak sensitive data via logs by sending malicious DNS-over-HTTPS responses to applications using the netfoil library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is GHSA-4ph6-mjv7-3fq6?
GHSA-4ph6-mjv7-3fq6 is a vulnerability in github.com/tinfoil-factory/netfoil, published on 24 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Summary
HTTPS RR data returned from the DoH server was not properly handled. Unverified APLN data (which could contain arbitrary byte sequences) was written directly to the log. It could also cause unnecessary memory usage. The single-byte response code was also written directly to the log.
Which versions are affected by GHSA-4ph6-mjv7-3fq6?
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 | 0.5.0 |
github.com/tinfoil-factory/netfoil Go | All versions | 0.5.0 |
github.com/tinfoil-factory/netfoil Go | All versions | 0.5.0 |
How do I fix GHSA-4ph6-mjv7-3fq6?
Upgrade github.com/tinfoil-factory/netfoil to 0.5.0 or later.
Is GHSA-4ph6-mjv7-3fq6 being exploited?
There is no known exploitation of GHSA-4ph6-mjv7-3fq6 in the wild and no public exploit code.
Sources
Also known as GO-2026-6277.