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Fencer Vulns
critical 9.8

CVE-2018-13259 json

An issue was discovered in zsh before 5.6.

published 2018-09-05 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-5207

cvss
9.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.7%
EPSS 2.7% chance of exploitation in 30 days, percentile 86%
public exploits
0
none known

Summary

An issue was discovered in zsh before 5.6. Shebang lines exceeding 64 characters were truncated, potentially leading to an execve call to a program name that is a substring of the intended one.

Patch / fix

  • zsh zsh 5.6
  • zsh Debian 14, Debian 13, Debian 12 5.6-1

debian advisories DEBIAN-CVE-2018-13259

  • 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-2018-13259

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 5.0.2-33.el7
  • zsh-html RHEL 7 5.0.2-33.el7

red hat advisories RHSA-2019:2017

  • zsh SLES 11 SP4-LTSS, SLE Point of Sale 11 SP3 4.3.6-67.9.8.1
  • zsh SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +10 more 5.0.5-6.12.2
  • zsh SLE Module for Basesystem 15 5.6-3.6.1

suse advisories SUSE-SU-2022:14910-1SUSE-SU-2022:0161-1SUSE-SU-2018:2686-1

  • zsh openSUSE Tumbleweed 5.8-7.7

opensuse advisories openSUSE-SU-2024:11543-1

  • zsh Arch Linux 5.6-1

arch linux advisories AVG-764

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-2018-13259 updated cvss 5.3

zsh: Improper handling of shebang line longer than 64

  • Red Hat Enterprise Linux 6 zsh, zsh-html
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux Client (v. 7) zsh 5.0.2-33.el7 Red Hat Enterprise Linux Client Optional (v. 7) zsh-html 5.0.2-33.el7 Red Hat Enterprise Linux ComputeNode (v. 7) zsh 5.0.2-33.el7 Red Hat Enterprise Linux ComputeNode Optional (v. 7) zsh-html 5.0.2-33.el7 Red Hat Enterprise Linux Server (v. 7) zsh 5.0.2-33.el7 Red Hat Enterprise Linux Server Optional (v. 7) zsh-html 5.0.2-33.el7
    +2 more products
    Red Hat Enterprise Linux Workstation (v. 7) zsh 5.0.2-33.el7 Red Hat Enterprise Linux Workstation Optional (v. 7) zsh-html 5.0.2-33.el7
    fixed: vendor fix RHSA-2019:2017
  • Red Hat Enterprise Linux 5 zsh 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

2.72% chance of exploitation in the next 30 days, higher than 86% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected products

  • n/a zsh before 5.6

Classification

Weakness
  • CWE-20 Improper Input Validation

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.