CVE-2026-33644
Medium
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.
SeverityMedium
CVSS4.3
Exploit probability—
Product
Lychee
PublishedMar 26, 2026
First seenMar 26, 2026
Weakness typeCWE-918Server-side request forgery (SSRF)
How to fix
Update
- lycheeorg lychee7.5.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| lycheeorg lychee | v < 7.5.2 | 7.5.2 |
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