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Fencer Vulns
high 7.8

CVE-2018-1100 json

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

published 2018-04-11 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-11748

cvss
7.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 45%
public exploits
0
none known

Summary

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.

Patch / fix

  • zsh Debian 14, Debian 13, Debian 12 5.5-1

debian advisories DEBIAN-CVE-2018-1100

  • zsh Ubuntu 14.04 LTS 5.0.2-3ubuntu6.3
  • zsh Ubuntu 16.04 LTS 5.1.1-1ubuntu2.3
  • zsh Ubuntu 18.04 LTS 5.4.2-3ubuntu3.1

ubuntu advisories UBUNTU-CVE-2018-1100

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • zsh RHEL 6 4.3.11-8.el6
  • zsh-html RHEL 6 4.3.11-8.el6
  • zsh RHEL 7 5.0.2-31.el7
  • zsh-html RHEL 7 5.0.2-31.el7

red hat advisories RHSA-2018:1932RHSA-2018:3073

  • zsh SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +10 more 5.0.5-6.19.1
  • zsh SLE Module for Basesystem 15 5.5-3.3.15
  • zsh SLES for SAP 11 SP4, SLES 11 SP4 4.3.6-67.9.3.1

suse advisories SUSE-SU-2022:0733-1SUSE-SU-2018:1874-1SUSE-SU-2018:1037-1

  • zsh openSUSE Tumbleweed 5.8-7.7

opensuse advisories openSUSE-SU-2024:11543-1

  • zsh Arch Linux 5.5-1

arch linux advisories AVG-669

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-1100 updated cvss 7.5

zsh: buffer overflow in utils.c:checkmailpath() can lead to local arbitrary code execution

  • Red Hat Enterprise Linux 5 zsh
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux Client (v. 7) zsh 5.0.2-31.el7 Red Hat Enterprise Linux Client Optional (v. 7) zsh-html 5.0.2-31.el7 Red Hat Enterprise Linux ComputeNode (v. 7) zsh 5.0.2-31.el7 Red Hat Enterprise Linux ComputeNode Optional (v. 7) zsh-html 5.0.2-31.el7
    fixed: vendor fix RHSA-2018:3073
  • Red Hat Enterprise Linux Desktop (v. 6) zsh 4.3.11-8.el6 Red Hat Enterprise Linux Desktop Optional (v. 6) zsh-html 4.3.11-8.el6
    fixed: vendor fix RHSA-2018:1932
  • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) zsh 5.0.2-31.el7 Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) zsh-html 5.0.2-31.el7
    fixed: vendor fix RHSA-2018:3073
  • Red Hat Enterprise Linux HPC Node (v. 6) zsh 4.3.11-8.el6 Red Hat Enterprise Linux HPC Node Optional (v. 6) zsh-html 4.3.11-8.el6 Red Hat Enterprise Linux Server (v. 6) zsh 4.3.11-8.el6
    fixed: vendor fix RHSA-2018:1932
  • Red Hat Enterprise Linux Server (v. 7) zsh 5.0.2-31.el7
    fixed: vendor fix RHSA-2018:3073
  • Red Hat Enterprise Linux Server Optional (v. 6) zsh-html 4.3.11-8.el6
    fixed: vendor fix RHSA-2018:1932
  • Red Hat Enterprise Linux Server Optional (v. 7) zsh-html 5.0.2-31.el7
    fixed: vendor fix RHSA-2018:3073
show 5 more
  • Red Hat Enterprise Linux Workstation (v. 6) zsh 4.3.11-8.el6
    fixed: vendor fix RHSA-2018:1932
  • Red Hat Enterprise Linux Workstation (v. 7) zsh 5.0.2-31.el7
    fixed: vendor fix RHSA-2018:3073
  • Red Hat Enterprise Linux Workstation Optional (v. 6) zsh-html 4.3.11-8.el6
    fixed: vendor fix RHSA-2018:1932
  • Red Hat Enterprise Linux Workstation Optional (v. 7) zsh-html 5.0.2-31.el7
    fixed: vendor fix RHSA-2018:3073
  • Red Hat Enterprise Linux 8 zsh, zsh-html
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.53% chance of exploitation in the next 30 days, higher than 45% of all scored CVEs (FIRST EPSS, 2026-11-08).

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

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.