zsh through version 5.4.2 is vulnerable to a stack-based buffer overflow in the utils.c:checkmailpath function. A local attacker could exploit this to...

References

• advisory https://access.redhat.com/errata/RHSA-2018:1932
• advisory https://access.redhat.com/errata/RHSA-2018:3073
• advisory https://security.gentoo.org/glsa/201805-10
• advisory https://usn.ubuntu.com/3764-1/
• patch https://sourceforge.net/p/zsh/code/ci/31f72205630687c1cef89347863aab355296a27f/
• report https://bugzilla.redhat.com/show_bug.cgi?id=1563395
• web https://lists.debian.org/debian-lts-announce/2020/12/msg00000.html