What’s Vulnerable › Vulnerabilities

CVE-2026-32733: Halloy has a file transfer path traveral vulnerability

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-20 · updated 2026-06-17
• Weakness: CWE-22

Description

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

• squidowl halloy: through 2026.4

References

• https://github.com/squidowl/halloy/commit/0f77b2cfc5f822517a256ea5a4b94bad8bfe38b6
• https://github.com/squidowl/halloy/security/advisories/GHSA-fqrv-rfg4-rv89

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