Provide references for CVE-2020-21048.
Where can I find more information about CVE-2020-21048?
References are available at: https://github.com/saitoha/libsixel/issues/73, https://github.com/saitoha/libsixel/commit/cb373ab6614c910407c5e5a93ab935144e62b037, https://github.com/saitoha/libsixel/releases/tag/v1.8.4, https://github.com/saitoha/libsixel/blob/master/ChangeLog, https://bitbucket.org/netbsd/pkgsrc/commits/6f0c011cbfccdffa635d04c84433b1a02687adad.