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TI-2022-06064 Aliases CVE-2022-21688GHSA-x7wr-283h-5h2v

Out-of-bounds Read in Onionshare

Priority MEDIUM 40CWE-125Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-125 and the CVSS impact.

Summary

OnionShare is an open source tool that lets you securely and anonymously share files, host websites, and chat with friends using the Tor network. Affected versions of the desktop application were found to be vulnerable to denial of service via an undisclosed vulnerability in the QT image parsing. Roughly 20 bytes lead to 2GB memory consumption and this can be triggered multiple times. To be abused, this vulnerability requires rendering in the history tab, so some user interaction is required. An adversary with knowledge of the Onion service address in public mode or with authentication in private mode can perform a Denial of Service attack, which quickly results in out-of-memory for the server. This requires the desktop application with rendered history, therefore the impact is only elevated. This issue has been patched in version 2.5.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00861 58th percentileScored 2026-11-07
Fix Fixed onionshare (onionshare): 2.5onionshare-cli (PyPI): 2.5

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
onionshareonionsharebefore 2.52.5Patch availableCNA
—onionshare-cli (PyPI)before 2.52.5Patch availableGHSA-x7wr-283h-5h2v
  • onionshare Vendoronionshare Affected before 2.5 Fixed in 2.5 Patch available CNA
  • onionshare-cli (PyPI) Vendor— Affected before 2.5 Fixed in 2.5 Patch available GHSA-x7wr-283h-5h2v

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:onionshare:onionshare:*:*:*:*:*:*:*:*before 2.5Vulnerableonionshare
  • cpe:2.3:a:onionshare:onionshare:*:*:*:*:*:*:*:* Versions before 2.5 Vulnerable ·onionshare

Remediation

  • Fix · CNA onionshare (onionshare) Fixed in 2.5
  • Fix · GHSA-x7wr-283h-5h2v onionshare-cli (PyPI) Fixed in 2.5 Advisory →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2022-21688
  2. 2026-10-03 Alias added: GHSA-x7wr-283h-5h2v

References

Advisory 3

Other 2

  • TI-2022-06066 Cross-Site Scripting in Onionshare CVSS 3.1HIGH 8.7
  • TI-2022-06068 Improper Access Control in Onionshare CVSS 3.1MEDIUM 4.3
  • TI-2021-18479 OnionShare 2.3 before 2.4 allows remote unauthenticated attackers to upload files on a… CVSS 3.1CRITICAL 9.8
  • TI-2022-06065 Denial of Service in Onionshare CVSS 3.1HIGH 7.5
  • TI-2022-06069 Path traversal in Onionshare CVSS 3.1MEDIUM 6.5
  • TI-2018-14146 The debug_mode function in web/web.py in OnionShare through 1.3.1, when --debug is… CVSS 3.0HIGH 7.0
See all 12 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences