CVE-2026-54545 @wakaru/cli arbitrary file write during bundle unpack
Attackers can write files outside the output directory via crafted filenames in malicious bundles, potentially achieving code execution when users unpack them.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-54545?
CVE-2026-54545 is a high-severity path traversal vulnerability in pionxzh wakaru, published on 28 Jul 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
wakaru is a JavaScript decompiler and unminifier toolkit. From 1.0.0 until 1.4.0, @wakaru/cli sanitizes bundle-controlled module filenames only once before writing extracted modules, so a crafted filename containing overlapping traversal sequences such as ....// collapses to ../ after sanitization and lets the final output path escape the selected output directory, allowing an attacker who can cause a user to run wakaru --unpack on a malicious bundle to write files outside that directory and, depending on the target path and environment, potentially achieve code execution. This issue is fixed in @wakaru/cli 1.4.0.
Weakness: CWE-22
Which versions are affected by CVE-2026-54545?
2 open source packages ship an affected version, including @wakaru/cli.
| Package | Affected | Fixed in |
|---|---|---|
@wakaru/cli npm | From 1.0.0 | 1.4.0 |
@wakaru/cli npm | From 1.0.0 | 1.4.0 |
How do I fix CVE-2026-54545?
Upgrade @wakaru/cli to 1.4.0 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-54545 being exploited?
There is no known exploitation of CVE-2026-54545 in the wild and no public exploit code.
Sources
Also known as GHSA-7wpj-vvmv-pgm8.