byrongamatos slopsmith up to 0.2.9-alpha.4 TOC File lib/psarc.py ZipFile.extractall path traversal

Summaryinfo

A vulnerability has been found in byrongamatos slopsmith up to 0.2.9-alpha.4 and classified as critical. Affected is the function ZipFile.extractall in the library lib/psarc.py of the component TOC File Handler. Performing a manipulation results in path traversal. This vulnerability is cataloged as CVE-2026-49290. It is possible to initiate the attack remotely. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as critical, was found in byrongamatos slopsmith up to 0.2.9-alpha.4. This affects the function ZipFile.extractall in the library lib/psarc.py of the component TOC File Handler. The manipulation with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Slopsmith is a self-contained web application for browsing, playing, and practicing Rocksmith 2014 Custom DLC (CDLC). Prior to 0.2.9-alpha.5, a path-traversal vulnerability in Slopsmith's archive extractors allows an attacker to write arbitrary files outside the extraction directory by supplying a crafted PSARC or sloppak archive. With the default Docker configuration (running as root) and the ability to drop a file into the plugin directory, this escalates to arbitrary remote code execution on the host. Three archive extractors concatenated archive-entry filenames directly onto the extraction root without validation: `lib/psarc.py::unpack_psarc` — PSARC TOC filenames; `lib/patcher.py::unpack_psarc` — duplicate of the above in the patcher flow; `lib/sloppak.py::_unpack_zip` — bare `ZipFile.extractall()` with no member filter. Each accepts entry names containing `..` segments, absolute paths, or backslash separators. The Python `zipfile` module's default `extractall()` is documented as not preventing traversal when callers don't supply a member-filter callback. Version 0.2.9-alpha.5 patches the issue. Until updated, do not open PSARC or sloppak archives from untrusted sources, and do not expose the Slopsmith instance to the public internet. Docker users should also pull the latest image after the next slopsmith Docker image is published.

It is possible to read the advisory at web.archive.org. This vulnerability is uniquely identified as CVE-2026-49290 since 05/28/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Additional levels of successful authentication are needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

Upgrading to version 0.2.9-alpha.5 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

• byrongamatos

Name

• slopsmith

Version

• 0.2.9-alpha.0
• 0.2.9-alpha.1
• 0.2.9-alpha.2
• 0.2.9-alpha.3
• 0.2.9-alpha.4

License

• open-source

Website

• Product: https://github.com/byrongamatos/slopsmith/

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