CVE-2026-54706: OnionShare follows symlinks in shared directories, allowing unintended disclosure of local files

Severity: medium (CVSS 4.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-31 · updated 2026-09-10
Weakness: CWE-59

Description

OnionShare is an open source tool that lets you securely and anonymously share files, host websites, and chat with friends using the Tor network. Prior to 2.6.4, OnionShare CLI/Desktop follows symbolic links in cli/onionshare_cli/web/send_base_mode.py through SendBaseModeWeb.set_file_info() and stream_individual_file(), allowing remote recipients of Share or Website mode to read local files outside the selected directory. This issue is fixed in version 2.6.4.

Affected products

onionshare: before 2.6.4

References

https://github.com/onionshare/onionshare/commit/48f31cfac077fcc9c04c67c2a6dbf87d956f5eec
https://github.com/onionshare/onionshare/releases/tag/v2.6.4
https://github.com/onionshare/onionshare/security/advisories/GHSA-22p9-r2f5-22mf
https://github.com/onionshare/onionshare/security/advisories/GHSA-22p9-r2f5-22mf

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