# CVE-2024-49770: oak's path traversal allows transfer of hidden files within the served root directory

> Attackers can bypass hidden file restrictions in oak middleware to read sensitive server data via URL-encoded path traversal.

- **Severity:** High 7.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 1 Nov 2024
- **Updated:** 1 Nov 2024
- **Also known as:** GHSA-qm92-93fv-vh7m

## What is CVE-2024-49770?

CVE-2024-49770 is a high-severity path traversal vulnerability in oakserver oak, published on 1 Nov 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

`oak` is a middleware framework for Deno's native HTTP server, Deno Deploy, Node.js 16.5 and later, Cloudflare Workers and Bun. By default `oak` does not allow transferring of hidden files with `Context.send` API. However, prior to version 17.1.3, this can be bypassed by encoding `/` as its URL encoded form `%2F`. For an attacker this has potential to read sensitive user data or to gain access to server secrets. Version 17.1.3 fixes the issue.

Weakness: CWE-35 (Path Traversal: '.../...//'), CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2024-49770?

2 open source packages ship an affected version, including @oakserver/oak.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `@oakserver/oak` | npm | All versions to 14.1.0 | None |
| `@oakserver/oak` | npm | All versions to 14.1.0 | None |

## How do I fix CVE-2024-49770?

No fix has been published for CVE-2024-49770 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-49770 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-49770 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-49770 and fix it if it is affected.

What it is: CVE-2024-49770 is a high-severity path traversal vulnerability in oakserver oak, published on 1 Nov 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-49770 exists.

Affected packages and fixed versions:
- @oakserver/oak (npm): affected all versions up to 14.1.0; no fix listed
- @oakserver/oak (npm): affected all versions up to 14.1.0; 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/CVE-2024-49770/ (Markdown: https://insights.sbomify.com/CVE-2024-49770/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-49770
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-49770
- OSV: https://osv.dev/vulnerability/CVE-2024-49770

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-49770/
Summaries are generated and may contain mistakes; the official description above is the record.