Type Confusion in SVG Sanitizer - #VU146566
Published: September 1, 2026
Vulnerability identifier: #VU146566
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-843
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to type confusion in cleanAttributesOnWhitelist() when sanitizing a crafted SVG file containing a DTD attribute declaration. A remote user can upload or submit a specially crafted SVG file to cause a denial of service.
The issue can crash the PHP process and terminate a PHP-FPM worker during SVG sanitization.
Affected software
SVG Sanitizer
Remediation
Install security update from vendor's website.
SVG Sanitizer - update to 1.0.0