Buffer overflow in Mutt 1.4.0 and possibly earlier versions, 1.5.x up to 1.5.3, and other programs that use Mutt code such as Balsa before 2.0.10, allows a remote malicious IMAP server to cause a denial of service (crash) and possibly execute arbitrary code via a crafted folder.

Buffer overflow in the index menu code (menupadstring of menu.c) for Mutt 1.4.1 and earlier allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via certain mail messages.

Race condition in the safeopen function in the Mutt mail client 1.5.12 and earlier, when creating temporary files in an NFS filesystem, allows local users to overwrite arbitrary files due to limitations of the use of the OEXCL flag on NFS filesystems.

The muttadvmktemp function in the Mutt mail client 1.5.12 and earlier does not properly verify that temporary files have been created with restricted permissions, which might allow local users to create files with weak permissions via a race condition between the mktemp and safefopen function calls.