# GHSA-vjgj-42f6-7997: netfoil's optional seccomp sandboxing was not applied

> The netfoil binary fails to apply optional seccomp sandboxing filters, reducing defense-in-depth protections for users who enable this feature.

- **Severity:** Not scored
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Not stated
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 29 Apr 2026
- **Also known as:** GO-2026-5664

## What is GHSA-vjgj-42f6-7997?

GHSA-vjgj-42f6-7997 is a vulnerability in github.com/tinfoil-factory/netfoil, published on 29 Apr 2026. 

### Official description

### Summary
The optional flag `--filter-system-calls` was not applied even if specified.

### Details
This is a defense in depth feature to apply additional seccomp filters after the binary has started. The example config also sandboxes the binary with systemd.

### Impact
Reduced sandboxing of the netfoil binary.

## Which versions are affected by GHSA-vjgj-42f6-7997?

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 | 0.2.1 |
| `github.com/tinfoil-factory/netfoil` | Go | All versions | 0.2.1 |
| `github.com/tinfoil-factory/netfoil` | Go | All versions | 0.2.1 |

## How do I fix GHSA-vjgj-42f6-7997?

Upgrade github.com/tinfoil-factory/netfoil to 0.2.1 or later.

## Is GHSA-vjgj-42f6-7997 being exploited?

There is no known exploitation of GHSA-vjgj-42f6-7997 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for GHSA-vjgj-42f6-7997 and fix it if it is affected.

What it is: GHSA-vjgj-42f6-7997 is a vulnerability in github.com/tinfoil-factory/netfoil, published on 29 Apr 2026. 
Exploitation: There is no known exploitation of GHSA-vjgj-42f6-7997 in the wild and no public exploit code.

Affected packages and fixed versions:
- github.com/tinfoil-factory/netfoil (Go): affected all versions; fixed in 0.2.1
- github.com/tinfoil-factory/netfoil (Go): affected all versions; fixed in 0.2.1
- github.com/tinfoil-factory/netfoil (Go): affected all versions; fixed in 0.2.1

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-vjgj-42f6-7997/ (Markdown: https://insights.sbomify.com/GHSA-vjgj-42f6-7997/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/GHSA-vjgj-42f6-7997

---
From sbomify Insights: https://insights.sbomify.com/GHSA-vjgj-42f6-7997/
Summaries are generated and may contain mistakes; the official description above is the record.