CVE-2022-21688

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    CVE-2022-21688

    Published: 18 Jan 2022Last Modified: 12 Aug 2026

    Summary: Out-of-bounds Read in Onionshare

    Details: 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.

    References: https://github.com/onionshare/onionshare/releases/tag/v2.5, https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/21xxx/CVE-2022-21688.json, https://github.com/onionshare/onionshare/security/advisories/GHSA-x7wr-283h-5h2v, https://nvd.nist.gov/vuln/detail/CVE-2022-21688

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -6642c25959f14daeb4a572798ccf4acd765d5795

    Affected versions

    v2.4.dev1

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2022-21688 | CVE-DB