LycheeOrg Lychee up to 7.5.x Import PhotoUrlRule.php Photo::fromUrl dns rebinding

Summaryinfo

A vulnerability classified as critical has been found in LycheeOrg Lychee up to 7.5.x. Affected is the function Photo::fromUrl of the file app/Rules/PhotoUrlRule.php of the component Import. This manipulation causes dns rebinding. This vulnerability is tracked as CVE-2026-57569. The attack is possible to be carried out remotely. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability has been found in LycheeOrg Lychee up to 7.5.x and classified as critical. Affected by this vulnerability is the function Photo::fromUrl of the file app/Rules/PhotoUrlRule.php of the component Import. The manipulation with an unknown input leads to a dns rebinding vulnerability. The CWE definition for the vulnerability is CWE-350. The product performs reverse DNS resolution on an IP address to obtain the hostname and make a security decision, but it does not properly ensure that the IP address is truly associated with the hostname. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Lychee is a free, open-source photo-management tool. Prior to 7.6.0, the POST /api/v2/Photo::fromUrl flow validates a hostname and its resolved addresses in app/Rules/PhotoUrlRule.php but later passes the original hostname through app/Actions/Import/FromUrl.php to app/Image/Files/DownloadedFile.php for a separate fopen connection. An authenticated attacker who controls DNS responses can cause validation to observe a public address and the subsequent fetch to resolve the same hostname to a private or otherwise forbidden address. This DNS rebinding time-of-check to time-of-use mismatch bypasses the intended server-side request forgery protections and can reach services available from the Lychee server, subject to deployment and TLS behavior. This issue is fixed in version 7.6.0.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-57569 since 06/24/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1583.002 according to MITRE ATT&CK.

By approaching the search of inurl:app/Rules/PhotoUrlRule.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 7.6.0 eliminates this vulnerability.

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Productinfo

Vendor

• LycheeOrg

Name

• Lychee

Version

• 7.0
• 7.1
• 7.2
• 7.3
• 7.4
• 7.5

Website

• Product: https://github.com/LycheeOrg/Lychee/

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