CVE catalog

CVE-2018-1100

zsh: CVE-2018-1100

Severity: High · CVSS 7.5CVSS:3.0/AV:L/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H
Published: Apr 7, 2018, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 0.53% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	zsh	sid	`5.9.2-1`	fixed
Debian	zsh	forky	`5.9.2-1`	fixed
Debian	zsh	trixie	`5.9-8`	fixed
Debian	zsh	bookworm	`5.9-4`	fixed
Ubuntu	zsh	14.04	`5.0.2-3ubuntu6`	vulnerable
Ubuntu	zsh	14.04	`5.0.2-3ubuntu6.1`	vulnerable
Ubuntu	zsh	14.04	`5.0.2-3ubuntu6.2`	vulnerable
Ubuntu	zsh	14.04	`5.0.2-3ubuntu6.3`	fixed
Ubuntu	zsh	16.04	`5.1.1-1ubuntu1`	vulnerable
Ubuntu	zsh	16.04	`5.1.1-1ubuntu2`	vulnerable
Ubuntu	zsh	16.04	`5.1.1-1ubuntu2.1`	vulnerable
Ubuntu	zsh	16.04	`5.1.1-1ubuntu2.2`	vulnerable
Ubuntu	zsh	16.04	`5.1.1-1ubuntu2.3`	fixed
Ubuntu	zsh	18.04	`5.2-5ubuntu1`	vulnerable
Ubuntu	zsh	18.04	`5.4.2-3ubuntu1`	vulnerable
Ubuntu	zsh	18.04	`5.4.2-3ubuntu2`	vulnerable
Ubuntu	zsh	18.04	`5.4.2-3ubuntu3`	vulnerable
Ubuntu	zsh	18.04	`5.4.2-3ubuntu3.1`	fixed
Suse	zsh	linux enterprise server 11 sp4	`4.3.6-67.9.3.1`	fixed
Suse	zsh	linux enterprise server for sap applications 11 sp4	`4.3.6-67.9.3.1`	fixed
Suse	zsh	hpe helion openstack 8	`5.0.5-6.19.1`	fixed
Suse	zsh	openstack cloud 8	`5.0.5-6.19.1`	fixed
Suse	zsh	openstack cloud 9	`5.0.5-6.19.1`	fixed
Suse	zsh	openstack cloud crowbar 8	`5.0.5-6.19.1`	fixed
Suse	zsh	openstack cloud crowbar 9	`5.0.5-6.19.1`	fixed
Suse	zsh	linux enterprise server for sap applications 12 sp3	`5.0.5-6.19.1`	fixed
Suse	zsh	linux enterprise server for sap applications 12 sp4	`5.0.5-6.19.1`	fixed
Suse	zsh	linux enterprise server 12 sp2-bcl	`5.0.5-6.19.1`	fixed
Suse	zsh	linux enterprise server 12 sp3-ltss	`5.0.5-6.19.1`	fixed
Suse	zsh	linux enterprise server 12 sp3-bcl	`5.0.5-6.19.1`	fixed
Suse	zsh	linux enterprise server 12 sp4-ltss	`5.0.5-6.19.1`	fixed
Suse	zsh	linux enterprise server 12 sp5	`5.0.5-6.19.1`	fixed
Suse	zsh	linux enterprise server for sap applications 12 sp5	`5.0.5-6.19.1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	zsh	source	sid	`5.5-1`	not yet assigned	Not reported	[895225]
Debian	zsh	source	forky	`5.5-1`	not yet assigned	Not reported	[895225]
Debian	zsh	source	trixie	`5.5-1`	not yet assigned	Not reported	[895225]
Debian	zsh	source	bookworm	`5.5-1`	not yet assigned	Not reported	[895225]
Ubuntu	zsh	deb	14.04	`5.0.2-3ubuntu6.3`	Not reported	UBUNTU-CVE-2018-1100	Not reported
Ubuntu	zsh	deb	16.04	`5.1.1-1ubuntu2.3`	Not reported	UBUNTU-CVE-2018-1100	Not reported
Ubuntu	zsh	deb	18.04	`5.4.2-3ubuntu3.1`	Not reported	UBUNTU-CVE-2018-1100	Not reported
Suse	zsh	rpm	linux enterprise server 11 sp4	`4.3.6-67.9.3.1`	Not reported	SUSE-SU-2018:1037-1	Not reported
Suse	zsh	rpm	linux enterprise server for sap applications 11 sp4	`4.3.6-67.9.3.1`	Not reported	SUSE-SU-2018:1037-1	Not reported
Suse	zsh	rpm	hpe helion openstack 8	`5.0.5-6.19.1`	Not reported	SUSE-SU-2022:0733-1	Not reported
Suse	zsh	rpm	openstack cloud 8	`5.0.5-6.19.1`	Not reported	SUSE-SU-2022:0733-1	Not reported
Suse	zsh	rpm	openstack cloud 9	`5.0.5-6.19.1`	Not reported	SUSE-SU-2022:0733-1	Not reported
Suse	zsh	rpm	openstack cloud crowbar 8	`5.0.5-6.19.1`	Not reported	SUSE-SU-2022:0733-1	Not reported
Suse	zsh	rpm	openstack cloud crowbar 9	`5.0.5-6.19.1`	Not reported	SUSE-SU-2022:0733-1	Not reported
Suse	zsh	rpm	linux enterprise server for sap applications 12 sp3	`5.0.5-6.19.1`	Not reported	SUSE-SU-2022:0733-1	Not reported
Suse	zsh	rpm	linux enterprise server for sap applications 12 sp4	`5.0.5-6.19.1`	Not reported	SUSE-SU-2022:0733-1	Not reported
Suse	zsh	rpm	linux enterprise server 12 sp2-bcl	`5.0.5-6.19.1`	Not reported	SUSE-SU-2022:0733-1	Not reported
Suse	zsh	rpm	linux enterprise server 12 sp3-ltss	`5.0.5-6.19.1`	Not reported	SUSE-SU-2022:0733-1	Not reported
Suse	zsh	rpm	linux enterprise server 12 sp3-bcl	`5.0.5-6.19.1`	Not reported	SUSE-SU-2022:0733-1	Not reported
Suse	zsh	rpm	linux enterprise server 12 sp4-ltss	`5.0.5-6.19.1`	Not reported	SUSE-SU-2022:0733-1	Not reported
Suse	zsh	rpm	linux enterprise server 12 sp5	`5.0.5-6.19.1`	Not reported	SUSE-SU-2022:0733-1	Not reported
Suse	zsh	rpm	linux enterprise server for sap applications 12 sp5	`5.0.5-6.19.1`	Not reported	SUSE-SU-2022:0733-1	Not reported

[Debian bug #895225]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[zsh]Fixed
Source package: [zsh]
Details (2)
- 5.9-4+b15 · amd64 · bookworm
  Fixed · Fixed: 5.5-1
  dsa · zsh · debian · bookworm; dsa · zsh · debian · 12
- 5.9-4+b15 · arm64 · bookworm
  Fixed · Fixed: 5.5-1
  dsa · zsh · debian · bookworm; dsa · zsh · debian · 12
[zsh-common]Fixed
Source package: [zsh]
Details (2)
- 5.9-4 · all · bookworm
  Fixed · Fixed: 5.5-1
  dsa · zsh · debian · bookworm; dsa · zsh · debian · 12
- 5.9-4 · all · bookworm
  Fixed · Fixed: 5.5-1
  dsa · zsh · debian · bookworm; dsa · zsh · debian · 12
[zsh-dev]Fixed
Source package: [zsh]
Details (2)
- 5.9-4+b15 · amd64 · bookworm
  Fixed · Fixed: 5.5-1
  dsa · zsh · debian · bookworm; dsa · zsh · debian · 12
- 5.9-4+b15 · arm64 · bookworm
  Fixed · Fixed: 5.5-1
  dsa · zsh · debian · bookworm; dsa · zsh · debian · 12
[zsh-doc]Fixed
Source package: [zsh]
Details (2)
- 5.9-4 · all · bookworm
  Fixed · Fixed: 5.5-1
  dsa · zsh · debian · bookworm; dsa · zsh · debian · 12
- 5.9-4 · all · bookworm
  Fixed · Fixed: 5.5-1
  dsa · zsh · debian · bookworm; dsa · zsh · debian · 12
[zsh-static]Fixed
Source package: [zsh]
Details (2)
- 5.9-4+b15 · amd64 · bookworm
  Fixed · Fixed: 5.5-1
  dsa · zsh · debian · bookworm; dsa · zsh · debian · 12
- 5.9-4+b15 · arm64 · bookworm
  Fixed · Fixed: 5.5-1
  dsa · zsh · debian · bookworm; dsa · zsh · debian · 12

[Debian 13 (Trixie)]

[zsh]Fixed
Source package: [zsh]
Details (2)
- 5.9-8+b23 · amd64 · trixie
  Fixed · Fixed: 5.5-1
  dsa · zsh · debian · 13
- 5.9-8+b23 · arm64 · trixie
  Fixed · Fixed: 5.5-1
  dsa · zsh · debian · 13
[zsh-common]Fixed
Source package: [zsh]
Details (2)
- 5.9-8 · all · trixie
  Fixed · Fixed: 5.5-1
  dsa · zsh · debian · 13
- 5.9-8 · all · trixie
  Fixed · Fixed: 5.5-1
  dsa · zsh · debian · 13
[zsh-dev]Fixed
Source package: [zsh]
Details (2)
- 5.9-8+b23 · amd64 · trixie
  Fixed · Fixed: 5.5-1
  dsa · zsh · debian · 13
- 5.9-8+b23 · arm64 · trixie
  Fixed · Fixed: 5.5-1
  dsa · zsh · debian · 13
[zsh-doc]Fixed
Source package: [zsh]
Details (2)
- 5.9-8 · all · trixie
  Fixed · Fixed: 5.5-1
  dsa · zsh · debian · 13
- 5.9-8 · all · trixie
  Fixed · Fixed: 5.5-1
  dsa · zsh · debian · 13
[zsh-static]Fixed
Source package: [zsh]
Details (2)
- 5.9-8+b23 · amd64 · trixie
  Fixed · Fixed: 5.5-1
  dsa · zsh · debian · 13
- 5.9-8+b23 · arm64 · trixie
  Fixed · Fixed: 5.5-1
  dsa · zsh · debian · 13

Observed: Oct 23, 2026, 5:33:34 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]