CVE-2026-33644
March 26, 2026
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.
Affected Packages
https://github.com/LycheeOrg/Lychee.git (GITHUB):
Affected version(s) >=v4.0.0-alpha.1 <v7.5.2Fix Suggestion:
Update to version v7.5.2https://github.com/LycheeOrg/Lychee.git (GITHUB):
Affected version(s) >=v4.0.0-alpha.1 <v7.5.2Fix Suggestion:
Update to version v7.5.2https://github.com/LycheeOrg/Lychee.git (GITHUB):
Affected version(s) >=v4.0.0-alpha.1 <v7.5.2Fix Suggestion:
Update to version v7.5.2https://github.com/LycheeOrg/Lychee.git (GITHUB):
Affected version(s) >=v4.0.0-alpha.1 <v7.5.2Fix Suggestion:
Update to version v7.5.2https://github.com/LycheeOrg/Lychee.git (GITHUB):
Affected version(s) >=v4.0.0-alpha.1 <v7.5.2Fix Suggestion:
Update to version v7.5.2https://github.com/LycheeOrg/Lychee.git (GITHUB):
Affected version(s) >=v4.0.0-alpha.1 <v7.5.2Fix Suggestion:
Update to version v7.5.2Related Resources (2)
Do you need more information?
Contact UsCVSS v4
Base Score:
2.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
LOW
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Server-Side Request Forgery (SSRF)
EPSS
Base Score:
0.04
