CVE-2026-32733: Halloy

Medium severity, CVSS 6.5. EPSS: 0.5% chance of exploitation in the next 30 days.

Halloy is an IRC application written in Rust. Prior to commit 0f77b2cfc5f822517a256ea5a4b94bad8bfe38b6, the DCC receive flow did not sanitize filenames from incoming `DCC SEND` requests. A remote IRC user could send a filename with path traversal sequences like `../../.ssh/authorized_keys` and the file would be written outside the user's configured `save_directory`. With auto-accept enabled this required zero interaction from the victim. Starting with commit 0f77b2cfc5f822517a256ea5a4b94bad8bfe38b6, all identified code paths sanitize filenames through a shared `sanitize_filename` function.

Affected products

• Halloy Halloy: up to and including 2026.4

Published 2026-03-20. Last modified 2026-06-17.