CVE-2026-33537: Lycheeorg Lychee

Medium severity, CVSS 5.0. EPSS: 0.3% chance of exploitation in the next 30 days.

Lychee is a free, open-source photo-management tool. The patch introduced for GHSA-cpgw-wgf3-xc6v (SSRF via `Photo::fromUrl`) contains an incomplete IP validation check that fails to block loopback addresses and link-local addresses. Prior to version 7.5.1, an authenticated user can still reach internal services using direct IP addresses, bypassing all four protection configuration settings even when they are set to their secure defaults. Version 7.5.1 contains a fix for the issue.

Affected products

• Lycheeorg Lychee: before 7.5.1 (fixed in 7.5.1)

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