thefuck: Arbitrary code execution via third-party rule loading
Summary
thefuck, a command-line tool that corrects previous console commands, loads third-party rule packages named thefuck_contrib_* from every sys.path entry. Their module code is executed before any enable/disable setting is applied, so a local user who can write to a Python path directory used by another user's interpreter can run code in that user's thefuck invocation. The attack requires local access and write permissions on a shared site-packages directory or virtualenv; no network exposure is known.
Affected
- thefuck 3.32
- Other versions: Unknown.
Fixed in
Unknown. No vendor fix or release was confirmed at the time of writing; check nvbn/thefuck#1623 for a fix.
Workaround
- Run thefuck only on single-user systems or with least-privilege accounts.
- Do not install or run it from directories writable by other users.
- Remove thefuck from shared virtualenvs and multi-user hosts where it is not needed.
- Check site-packages for unexpected thefuck_contrib_* directories.
Exploitation
- Public proof of concept available (CISA SSVC: Exploitation poc, Automatable no).
- No in-the-wild exploitation known.
- Not listed in CISA KEV.
Our recommendation
- Inventory thefuck installations (e.g. pip show thefuck, apt list --installed | grep thefuck).
- Remove thefuck where unused, especially on shared servers, jump hosts and multi-user workstations.
- Restrict write access to Python site-packages and virtualenvs to the owning user.
- Check for unexpected thefuck_contrib_* packages.
- Install a fixed version once published; monitor nvbn/thefuck#1623. Priority: low to medium.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Upstream issue nvbn/thefuck#1623 github.com
- REYu6 python-vuln report (proof of concept) github.com
- Ubuntu CVE tracker entry ubuntu.com
- OpenCVE CVE-2026-95168 app.opencve.io
- VulnRichment CVE-2026-95168 vulners.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 1 Nov 2026, 23:33.
Original description (NVD)
An issue in nvbn thefuck v.3.32 allows a local attacker to execute arbitrary code via the get_rules_import_paths in thefuck/corrector.py and Rule.from_path in thefuck/types.py
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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