# GHSA-f99h-w337-mv56: Panic when parsing ranges with invalid masks in github.com/malfunkt/iprange

> An attacker can cause a denial of service by providing an IP range with an invalid mask larger than 32 bits to the iprange library.

- **Severity:** Not scored
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 11 Jul 2023
- **Also known as:** GO-2023-1857

## What is GHSA-f99h-w337-mv56?

GHSA-f99h-w337-mv56 is a denial of service vulnerability in github.com/malfunkt/iprange, published on 11 Jul 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Parsing a range with a mask larger than 32 bits causes a panic.

## Which versions are affected by GHSA-f99h-w337-mv56?

3 open source packages ship an affected version, including github.com/malfunkt/iprange.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `github.com/malfunkt/iprange` | Go | All versions | None |
| `github.com/malfunkt/iprange` | Go | All versions to 0.9.0 | None |
| `github.com/malfunkt/iprange` | Go | All versions to 0.9.0 | None |

## How do I fix GHSA-f99h-w337-mv56?

No fix has been published for GHSA-f99h-w337-mv56 yet. Limit exposure of the affected software until one is available.

## Is GHSA-f99h-w337-mv56 being exploited?

There is no known exploitation of GHSA-f99h-w337-mv56 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for GHSA-f99h-w337-mv56 and fix it if it is affected.

What it is: GHSA-f99h-w337-mv56 is a denial of service vulnerability in github.com/malfunkt/iprange, published on 11 Jul 2023. 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-f99h-w337-mv56 in the wild and no public exploit code.

Affected packages and fixed versions:
- github.com/malfunkt/iprange (Go): affected all versions; no fix listed
- github.com/malfunkt/iprange (Go): affected all versions up to 0.9.0; no fix listed
- github.com/malfunkt/iprange (Go): affected all versions up to 0.9.0; no fix listed

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-f99h-w337-mv56/ (Markdown: https://insights.sbomify.com/GHSA-f99h-w337-mv56/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/GHSA-f99h-w337-mv56

---
From sbomify Insights: https://insights.sbomify.com/GHSA-f99h-w337-mv56/
Summaries are generated and may contain mistakes; the official description above is the record.