user/libebml: CVE-2021-3405: heap overflow bug in libebml before 1.4.2
CVE-2021-3405: In libebml before 1.4.2, a heap overflow bug exists in the implementation of EbmlString::ReadData and EbmlUnicodeString::ReadData.
CVE-2021-3405: In libebml before 1.4.2, a heap overflow bug exists in the implementation of EbmlString::ReadData and EbmlUnicodeString::ReadData.