# GHSA-7856-g3gv-9wq8: netfoil: Attacker controlled data written to logs

> Attackers can inject unvalidated domain names into logs, potentially leading to log injection or information disclosure depending on log consumption.

- **Severity:** Not scored
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 7 Jul 2026
- **Also known as:** GO-2026-5935

## What is GHSA-7856-g3gv-9wq8?

GHSA-7856-g3gv-9wq8 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
Domain names were written to the log without first being validated to contain allowed characters.

### Impact
Depends on how the logs were used.

## Which versions are affected by GHSA-7856-g3gv-9wq8?

3 open source packages ship an affected version, including github.com/tinfoil-factory/netfoil.


| Package | Ecosystem | 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-7856-g3gv-9wq8?

Upgrade github.com/tinfoil-factory/netfoil to 0.3.0 or later.

## Is GHSA-7856-g3gv-9wq8 being exploited?

There is no known exploitation of GHSA-7856-g3gv-9wq8 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for GHSA-7856-g3gv-9wq8 and fix it if it is affected.

What it is: GHSA-7856-g3gv-9wq8 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.
Exploitation: There is no known exploitation of GHSA-7856-g3gv-9wq8 in the wild and no public exploit code.

Affected packages and fixed versions:
- github.com/tinfoil-factory/netfoil (Go): affected all versions; fixed in 0.3.0
- github.com/tinfoil-factory/netfoil (Go): affected all versions; fixed in 0.3.0
- github.com/tinfoil-factory/netfoil (Go): affected all versions; fixed in 0.3.0

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/GHSA-7856-g3gv-9wq8/ (Markdown: https://insights.sbomify.com/GHSA-7856-g3gv-9wq8/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/GHSA-7856-g3gv-9wq8

---
From sbomify Insights: https://insights.sbomify.com/GHSA-7856-g3gv-9wq8/
Summaries are generated and may contain mistakes; the official description above is the record.