Path Traversal in Halloy
CVE-2026-32733
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.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.004 (36.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 36.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.001
Affected products
- Halloy
- Squidowl Halloy — versions <= 2026.4
Weakness classification (CWE)
References
- github.com/squidowl/halloy/security/advisories/GHSA-fqrv-rfg4-rv89 (Exploit, Vendor Advisory)
- github.com/squidowl/halloy/commit/0f77b2cfc5f822517a256ea5a4b94bad8bfe38b6 (Patch)
Frequently asked questions
- What is CVE-2026-32733?
- CVE-2026-32733 is a medium-severity vulnerability in Halloy, classified under Path Traversal. CVSS score: 6.5/10. Published 2026-03-20.
- How severe is CVE-2026-32733?
- Medium severity. CVSS v3 base score is 6.5 out of 10.