Provide references for CVE-2020-21049.
Where can I find more information about CVE-2020-21049?
References are available at: https://github.com/saitoha/libsixel/blob/master/ChangeLog, https://github.com/saitoha/libsixel/issues/74, https://github.com/saitoha/libsixel/commit/0b1e0b3f7b44233f84e5c9f512f8c90d6bbbe33d, https://github.com/saitoha/libsixel/releases/tag/v1.8.5, https://bitbucket.org/netbsd/pkgsrc/commits/970a81d31ec7498e04d09b6b7771cef35f63cd28.