An issue was discovered in TCPDF before 6.8.0. If libcurl is used, CURLOPTSSLVERIFYHOST and CURLOPTSSLVERIFYPEER are set unsafely.
An issue was discovered in TCPDF before 6.2.22. Attackers can trigger deserialization of arbitrary data via the phar:// wrapper.
TCPDF version 6.6.5 and before is vulnerable to ReDoS (Regular Expression Denial of Service) if parsing an untrusted SVG file.