# GHSA-3g4q-2f67-2gvh: netfoil has a resource leak in LRU cache

> A local attacker can exhaust memory in the netfoil LRU cache, causing service restarts due to resource leaks.

- **Severity:** Not scored
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 7 Jul 2026
- **Also known as:** GO-2026-5933

## What is GHSA-3g4q-2f67-2gvh?

GHSA-3g4q-2f67-2gvh is a denial of service vulnerability in github.com/tinfoil-factory/netfoil, published on 7 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

### Summary
When an entry was removed from the LRU cache, a pointer to the removed element was not properly cleaned up.

### Impact
A local attacker can get netfoil to use more memory. By default this is limited to 100MB via systemd, which would trigger service restarts when reached.

## Which versions are affected by GHSA-3g4q-2f67-2gvh?

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-3g4q-2f67-2gvh?

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

## Is GHSA-3g4q-2f67-2gvh being exploited?

There is no known exploitation of GHSA-3g4q-2f67-2gvh in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for GHSA-3g4q-2f67-2gvh and fix it if it is affected.

What it is: GHSA-3g4q-2f67-2gvh is a denial of service vulnerability in github.com/tinfoil-factory/netfoil, published on 7 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of GHSA-3g4q-2f67-2gvh 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-3g4q-2f67-2gvh/ (Markdown: https://insights.sbomify.com/GHSA-3g4q-2f67-2gvh/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/GHSA-3g4q-2f67-2gvh

---
From sbomify Insights: https://insights.sbomify.com/GHSA-3g4q-2f67-2gvh/
Summaries are generated and may contain mistakes; the official description above is the record.