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Fencer Vulns
medium 5.5

CVE-2018-1071 json

zsh through version 5.4.2 is vulnerable to a stack-based buffer overflow in the exec.c:hashcmd() function.

published 2018-03-09 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-11723

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 37%
public exploits
0
none known

Summary

zsh through version 5.4.2 is vulnerable to a stack-based buffer overflow in the exec.c:hashcmd() function. A local attacker could exploit this to cause a denial of service.

Patch / fix

  • zsh Debian 14, Debian 13, Debian 12 5.4.2-4

debian advisories DEBIAN-CVE-2018-1071

  • zsh Ubuntu 14.04 LTS 5.0.2-3ubuntu6.2
  • zsh Ubuntu 16.04 LTS 5.1.1-1ubuntu2.2

ubuntu advisories UBUNTU-CVE-2018-1071

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 7 5.0.2-31.el7
  • zsh-html RHEL 7 5.0.2-31.el7

red hat advisories RHSA-2018:3073

  • zsh SLES 11 SP4-LTSS, SLE Point of Sale 11 SP3 4.3.6-67.9.8.1
  • zsh SLE Module for Basesystem 15 5.5-3.3.15
  • zsh SLES for SAP 12 SP3, SLES 12 SP3, SLED 12 SP3 5.0.5-6.7.2

suse advisories SUSE-SU-2022:14910-1SUSE-SU-2018:1874-1SUSE-SU-2018:1072-1

  • zsh openSUSE Tumbleweed 5.8-7.7

opensuse advisories openSUSE-SU-2024:11543-1

  • zsh Alpine 3.24, Alpine 3.23, Alpine 3.22 +15 more 5.4.2-r1
  • zsh Alpine 3.4 5.2-r2
  • zsh Alpine 3.5 5.2-r4
  • zsh Alpine 3.6 5.3.1-r1

alpine advisories ALPINE-CVE-2018-1071

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • zsh Arch Linux 5.5-1

arch linux advisories AVG-652

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-2018-1071 updated cvss 3.3

zsh: Stack-based buffer overflow in exec.c:hashcmd()

  • Red Hat Enterprise Linux 5 zsh Red Hat Enterprise Linux 6 zsh, zsh-html
    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 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
    +4 more products
    Red Hat Enterprise Linux Server (v. 7) zsh 5.0.2-31.el7 Red Hat Enterprise Linux Server Optional (v. 7) zsh-html 5.0.2-31.el7 Red Hat Enterprise Linux Workstation (v. 7) zsh 5.0.2-31.el7 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

0.43% chance of exploitation in the next 30 days, higher than 37% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 2.1 AV:L/AC:L/Au:N/C:N/I:N/A:P

Affected products

  • zsh zsh

Classification

Weakness

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.