Improper Input Validation
Dompdf is an HTML to PDF converter for PHP. When parsing SVG images, Dompdf performs an initial validation to ensure that paths within the SVG are allowed. One of the validations is that the SVG document does not reference itself. In dompdf/dompdf package prior to version 2.0.4, a recursive chain using two or more SVG documents was not correctly validated. Depending on the system configuration and attack pattern, this could exhaust the memory available to the executing process and/or to the server itself. "php-svg-lib', when run in isolation, does not support SVG references for `image` elements. However, when used in combination with Dompdf, "php-svg-lib" will process SVG images referenced by an `image` element. Dompdf currently includes validation to prevent self-referential `image` references, but a chained reference is not checked. A malicious actor may thus trigger infinite recursion by chaining references between two or more SVG images. When Dompdf parses a malicious payload, it will crash due to exceeding the allowed execution time or memory usage. An attacker sending multiple requests to a system can potentially cause resource exhaustion to the point that the system is unable to handle incoming requests.
CWE-20 - Improper Input Validation
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.