# CVE-2026-57233: Notepad++: Path Traversal (Zip Slip) in WinGup Plugin Extraction

> Attackers can overwrite plugin DLLs via Zip Slip in WinGup, leading to arbitrary code execution when Notepad++ loads the modified plugin.

- **Severity:** High 8.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 17 Aug 2026
- **Updated:** 18 Aug 2026
- **Also known as:** GHSA-hjxw-84rf-wg5r

## What is CVE-2026-57233?

CVE-2026-57233 is a high-severity path traversal vulnerability in notepad-plus-plus, published on 17 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Notepad++ is a free and open-source source code editor. Prior to 8.9.7, the WinGup decompress function joins untrusted ZIP entry names to unzipDestTo without canonical containment validation, allowing an entry such as ../mimeTools/mimeTools.dll to overwrite a DLL in a sibling plugin directory and execute attacker-controlled code when Notepad++ next loads that plugin. This issue is fixed in version 8.9.7.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2026-57233?


## How do I fix CVE-2026-57233?

No fix has been published for CVE-2026-57233 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-57233 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-57233 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-57233 and fix it if it is affected.

What it is: CVE-2026-57233 is a high-severity path traversal vulnerability in notepad-plus-plus, published on 17 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-57233 exists.

Affected product: notepad-plus-plus. No package-level version data is available, so check the vendor advisory linked from the reference page.

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-2026-57233/ (Markdown: https://insights.sbomify.com/CVE-2026-57233/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-57233
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-57233
- OSV: https://osv.dev/vulnerability/CVE-2026-57233

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-57233/
Summaries are generated and may contain mistakes; the official description above is the record.