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Untriaged
Permalink CVE-2026-33644
created 2 weeks, 5 days ago
Lychee has SSRF bypass via DNS rebinding — PhotoUrlRule only validates IP addresses, not hostnames resolving to internal IPs

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

Lychee
  • ==< 7.5.2

Matching in nixpkgs

pkgs.lychee

Fast, async, stream-based link checker written in Rust

pkgs.lycheeslicer

All-in-one 3D slicer for resin and FDM printers

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