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CRITICAL severity

CVE-2021-41868 — onionshare-cli

CRITICALFix: onionshare/onionshare#1404

CVE-2021-41868 is a critical-severity (CVSS 9.8) vulnerability in onionshare-cli. 1 public exploit reference exists, so weaponization risk is real. A fix is available for onionshare-cli — see the affected versions and patch details below.

Remote unauthenticated attackers able to upload files in Onionshare

Also known asGHSA-7g47-xxff-9p85PYSEC-2026-434
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Oct 7, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
2.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs84th percentile — riskier than 84% of all scored CVEsHighest risk
0.20%1.11%2.02%2.93%0.7%2.4%Apr 26Aug 26Oct 26

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

How urgent is this, really

CVE-2021-41868 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,738 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
🐍onionshare-cli

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

OnionShare 2.3 before 2.4 allows remote unauthenticated attackers to upload files on a non-public node when using the --receive functionality.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPIonionshare-cli≥ 2.3&&< 2.42.4pip install --upgrade 'onionshare-cli==2.4'

Affected Products

1 product · 1 configurations
Application
onionshareonionshare
≥ 2.3 && < 2.4
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.

OnionShare 2.3 before 2.4 allows remote unauthenticated attackers to upl…

ihteam.netNVDOct 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 onionshare-cli, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update onionshare-cli to 2.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-41868 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

OnionShare 2.3 before 2.4 allows remote unauthenticated attackers to upload files on a non-public node when using the --receive functionality.
O3 Security · Impact-Aware SCA

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CVE-2021-41868: onionshare-cli — Fixed in 2.4