tidy-html5 vulnerabilities (OSS-Fuzz)

4 vulnerabilities.

• tidy-html5 OSS-Fuzz Heap-use-after-free in prvTidyInsertedToken OSV-2021-1135 Fix available No scoreAugust 16, 2021
• tidy-html5 OSS-Fuzz Stack-buffer-overflow in strcat OSV-2021-1085 No scoreAugust 2, 2021
• tidy-html5 OSS-Fuzz Heap-buffer-overflow in prvTidygrowStack OSV-2021-1078 Fix available No scoreJuly 31, 2021
• tidy-html5 OSS-Fuzz UNKNOWN READ in ParseXMLElement OSV-2021-1076 No scoreJuly 31, 2021