Unrated severityNVD Advisory· Published Mar 26, 2026· Updated Mar 30, 2026
Lychee has SSRF bypass via DNS rebinding — PhotoUrlRule only validates IP addresses, not hostnames resolving to internal IPs
CVE-2026-33644
Description
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.
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Affected products
2Patches
Vulnerability mechanics
References
2- github.com/LycheeOrg/Lychee/commit/28c5261fb9deab4f9420c8cc2f73a87425939107mitrex_refsource_MISC
- github.com/LycheeOrg/Lychee/security/advisories/GHSA-5245-4p8c-jwffmitrex_refsource_CONFIRM
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