CVE-2026-77468

Lychee is a free, open-source photo-management tool. Prior to 7.7.0, GET /docs/api exposes the Scramble-generated OpenAPI documentation configured by config/scramble.php to unauthenticated callers after installation, with observed response size and latency suggesting that the schema is regenerated without an application-level cache. A remote attacker can repeatedly request the unthrottled route to consume server CPU and obtain a detailed map of the API surface and parameter schema. This issue is fixed in version 7.7.0.

• https://github.com/LycheeOrg/Lychee/commit/711f4290f53cd980cd5baa2434c734d364e9fe33
• https://github.com/LycheeOrg/Lychee/pull/4510
• https://github.com/LycheeOrg/Lychee/releases/tag/v7.7.0
• https://github.com/LycheeOrg/Lychee/security/advisories/GHSA-xg8r-4pm3-2h4f