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CRITICAL severity

CVE-2021-34363 — thefuck

CRITICALFix: nvbn/thefuck@e343c57

CVE-2021-34363 is a critical-severity (CVSS 9.1) Path Traversal vulnerability in thefuck. A fix is available for thefuck — see the affected versions and patch details below.

The Fuck Arbitrary File Deletion via Path Traversal

Also known asGHSA-8wwf-2644-f8x4PYSEC-2021-97
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 9, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.8%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs78th percentile — riskier than 78% of all scored CVEsHighest risk
0.63%1.20%1.77%2.35%1.1%1.8%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2021-34363 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,987 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected
🐍thefuck

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

Description

The thefuck (aka The Fuck) is app that corrects errors in previous console commands. The Fuck python package before 3.31 allows Path Traversal that leads to arbitrary file deletion via the undo archive operation feature.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPIthefuckall versions3.31pip install --upgrade 'thefuck==3.31'

Affected Products

2 products · 3 configurations
OS
fedorafedoraproject
2 versions
3435
Application
the fuckthe_fuck_project
< 3.31
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for thefuck, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update thefuck to 3.31 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-34363 is resolved across your whole dependency graph.

  3. Workarounds

    Resolve every user-supplied path to its canonical form and reject anything that escapes the intended directory, and run the component under an account that has no read or write access outside the directory it legitimately serves.

Frequently Asked Questions

The thefuck (aka _The Fuck_) is app that corrects errors in previous console commands. _The Fuck_ python package before 3.31 allows Path Traversal that leads to arbitrary file deletion via the `undo archive operation` feature.
O3 Security · Impact-Aware SCA

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CVE-2021-34363: thefuck Path Traversal — Fixed in 3.31