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Ubuntu Security Notice USN-7625-1
July 08, 2025

onionshare vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in OnionShare.

Software Description:
- onionshare: An open source tool that lets you securely and anonymously share files, host websites, and chat with friends using the Tor network

Details:

It was discovered that OnionShare could be exploited when run with
the --debug argument. A local attacker could possibly use this
issue to access sensitive information. This issue only affected
Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. (CVE-2018-19960)

It was discovered that OnionShare could be blocked from uploading
files. An attacker could possibly use this issue to cause a
denial of service. This issue only affected Ubuntu 20.04 LTS and
Ubuntu 22.04 LTS. (CVE-2022-21689)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 22.04 LTS
  onionshare                      2.2-3ubuntu0.1~esm1
                                  Available with Ubuntu Pro

Ubuntu 20.04 LTS
  onionshare                      2.2-1ubuntu0.1~esm1
                                  Available with Ubuntu Pro

Ubuntu 18.04 LTS
  onionshare                      0.9.2-1ubuntu0.1~esm1
                                  Available with Ubuntu Pro

Ubuntu 16.04 LTS
  onionshare                      0.8.1-1ubuntu0.1~esm1
                                  Available with Ubuntu Pro

After a standard system update you need to restart OnionShare to make
all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-7625-1
  CVE-2018-19960, CVE-2022-21689