zsh through version 5.4.2 is vulnerable to a stack-based buffer overflow in the utils.c:checkmailpath function.

Published 8 y ago 2018-04-11 · modified 4 mo ago 2026-06-17 · JSON

CVSS

7.8

v3.1 · NVD

CISA KEV

not known exploited

EPSS

0.5%

percentile 45%

Public exploits

none known

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.

Exploit prediction (EPSS)

0.53% probability of exploitation in the next 30 days, higher than 45% of all scored CVEs.

CVSS scores

Assigned by	Version	Score	Vector
NVD	3.1	7.8	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`
NVD	2.0	7.2	`AV:L/AC:L/Au:N/C:C/I:C/A:C`

Affected products

zsh zsh

Classification

Weakness

CWE-120 Buffer Copy without Checking Size of Input
CWE-787 Out-of-bounds Write

References

sourceforge.net /p/zsh/code/ci/31f72205630687c1cef89347863aab355296a27f/ · x_refsource_CONFIRM, x_transferred
usn.ubuntu.com /3764-1/ · vendor-advisory, x_refsource_UBUNTU, x_transferred
security.gentoo.org /glsa/201805-10 · vendor-advisory, x_refsource_GENTOO, x_transferred
access.redhat.com /errata/RHSA-2018:1932 · vendor-advisory, x_refsource_REDHAT, x_transferred
bugzilla.redhat.com /show_bug.cgi?id=1563395 · x_refsource_CONFIRM, x_transferred
access.redhat.com /errata/RHSA-2018:3073 · vendor-advisory, x_refsource_REDHAT, x_transferred
lists.debian.org /debian-lts-announce/2020/12/msg00000.html · mailing-list, x_refsource_MLIST, x_transferred

Sources

CVE List: CVE-2018-1100
NVD: CVE-2018-1100

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