# GHSA-q3w9-g74q-vp5f: Denial of Service in express-fileupload

> An attacker can cause server delays and potential denial of service by sending requests with large filenames consisting of dots.

- **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:** 3 Sep 2020

## What is GHSA-q3w9-g74q-vp5f?

GHSA-q3w9-g74q-vp5f is a denial of service vulnerability in express-fileupload, published on 3 Sep 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Versions of `express-fileupload` prior to 1.1.6-alpha.6 are vulnerable to Denial of Service. The package causes server responses to be delayed (up to 30s in internal testing) if the request contains a large `filename` of `.` characters.

## Recommendation

Upgrade to version 1.1.6-alpha.6 or later.

## Which versions are affected by GHSA-q3w9-g74q-vp5f?

2 open source packages ship an affected version, including express-fileupload.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `express-fileupload` | npm | All versions | 1.1.6-alpha.6 |
| `express-fileupload` | npm | All versions | 1.1.6-alpha.6 |

## How do I fix GHSA-q3w9-g74q-vp5f?

Upgrade express-fileupload to 1.1.6-alpha.6 or later.

## Is GHSA-q3w9-g74q-vp5f being exploited?

There is no known exploitation of GHSA-q3w9-g74q-vp5f in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for GHSA-q3w9-g74q-vp5f and fix it if it is affected.

What it is: GHSA-q3w9-g74q-vp5f is a denial of service vulnerability in express-fileupload, published on 3 Sep 2020. 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-q3w9-g74q-vp5f in the wild and no public exploit code.

Affected packages and fixed versions:
- express-fileupload (npm): affected all versions; fixed in 1.1.6-alpha.6
- express-fileupload (npm): affected all versions; fixed in 1.1.6-alpha.6

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-q3w9-g74q-vp5f/ (Markdown: https://insights.sbomify.com/GHSA-q3w9-g74q-vp5f/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/GHSA-q3w9-g74q-vp5f

---
From sbomify Insights: https://insights.sbomify.com/GHSA-q3w9-g74q-vp5f/
Summaries are generated and may contain mistakes; the official description above is the record.