Buffer overflow in copy.c in Mutt before 1.5.23 allows remote attackers to cause a denial of service (crash) via a crafted RFC2047 header line, related to address expansion.

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.

Buffer overflow in the muttdecodexbit function in Handler.c for Mutt 1.5.10 allows remote attackers to execute arbitrary code, possibly due to interactions with libiconv or gettext.