CVE-2026-33644: Lycheeorg Lychee

Medium severity, CVSS 4.3. EPSS: 0.3% chance of exploitation in the next 30 days.

Lychee is a free, open-source photo-management tool. Prior to version 7.5.2, the SSRF protection in `PhotoUrlRule.php` can be bypassed using DNS rebinding. The IP validation check (line 86-89) only activates when the hostname is an IP address. When a domain name is used, `filter_var($host, FILTER_VALIDATE_IP)` returns `false`, skipping the entire check. Version 7.5.2 patches the issue.

Affected products

• Lycheeorg Lychee: before 7.5.2 (fixed in 7.5.2)

Published 2026-03-26. Last modified 2026-06-17.