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MEDIUM severity

Path Traversal in bikshedGHSA-hf6p-4rv2-9qrp

MEDIUMFix: tabatkins/bikeshed@b2f668f

GHSA-hf6p-4rv2-9qrp is a medium-severity (CVSS 5.5) Path Traversal vulnerability in bikeshed. 1 public exploit reference exists, so weaponization risk is real. A fix is available for bikeshed — see the affected versions and patch details below.

Also known asCVE-2021-23423PYSEC-2021-117SNYK-PYTHON-BIKESHED-1537647
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Oct 12, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.1%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs65th percentile — riskier than 65% of all scored CVEsHighest risk
0.00%0.54%1.07%1.61%0.4%0.4%1.1%1.1%Apr 26Aug 26Oct 26

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

How urgent is this, really

GHSA-hf6p-4rv2-9qrp 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
🐍bikeshed

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

This affects the package bikeshed before 3.0.0. This can occur when an untrusted source file containing include, include-code or include-raw block is processed. The contents of arbitrary files could be disclosed in the HTML output.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPIbikeshedall versions3.0.0pip install --upgrade 'bikeshed==3.0.0'

Affected Products

1 product · 1 configurations
Application
bikeshedbikeshed_project
< 3.0.0
range
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

This affects the package bikeshed before 3.0.0. This can occur when an u…

snyk.ioNVDAug 2021

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Fix

    Update bikeshed to 3.0.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-hf6p-4rv2-9qrp 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

This affects the package bikeshed before 3.0.0. This can occur when an untrusted source file containing include, include-code or include-raw block is processed. The contents of arbitrary files could be disclosed in the HTML output.
O3 Security · Impact-Aware SCA

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Path Traversal in bikshed (Medium 5.5)