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Untriaged

Permalink CVE-2026-33644

created 1 month ago Activity log

Created suggestion 1 month 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.

References

https://github.com/LycheeOrg/Lychee/security/advisories/GHSA-5245-4p8c-jwff x_refsource_CONFIRM
https://github.com/LycheeOrg/Lychee/commit/28c5261fb9deab4f9420c8cc2f73a87425939107 x_refsource_MISC

Affected products

Lychee

==< 7.5.2

Matching in nixpkgs

pkgs.lychee

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

nixos-unstable 0.23.0
- nixpkgs-unstable 0.23.0
- nixos-unstable-small 0.23.0
nixos-25.11 0.21.0
- nixos-25.11-small 0.21.0
- nixpkgs-25.11-darwin 0.21.0

pkgs.LycheeSlicer

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

nixos-unstable 7.6.3
- nixpkgs-unstable 7.6.2
- nixos-unstable-small 7.6.3
nixos-25.11 7.5.0
- nixos-25.11-small 7.5.0
- nixpkgs-25.11-darwin 7.5.0

pkgs.lycheeslicer

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

nixos-unstable 7.6.3
- nixpkgs-unstable 7.6.2
- nixos-unstable-small 7.6.3

pkgs.tests.testers.lycheeLinkCheck.ok

None

nixos-unstable -
- nixpkgs-unstable
- nixos-unstable-small
nixos-25.11 -
- nixos-25.11-small
- nixpkgs-25.11-darwin

pkgs.tests.testers.lycheeLinkCheck.network

None

nixos-unstable -
- nixpkgs-unstable
- nixos-unstable-small
nixos-25.11 -
- nixos-25.11-small
- nixpkgs-25.11-darwin

Package maintainers

@Tarinaky Tarinaky
@totoroot Matthias Thym <git@thym.at>
@tuxinaut Denny Schäfer <trash4you@tuxinaut.de>
@ZachDavies Zach Davies <zdmalta@proton.me>