CVE-2018-1100

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-04-11 · updated 2026-06-17
Weakness: CWE-120

Description

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 execute arbitrary code in the context of another user.

Affected products

Canonical Ubuntu Linux: 14.04, 16.04, 18.04
RedHat Enterprise Linux Desktop: 6.0, 7.0
RedHat Enterprise Linux Server: 6.0, 7.0
RedHat Enterprise Linux Workstation: 6.0, 7.0
zsh: through 5.4.2

References

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

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