CVE-2018-1071 — zsh: Stack-based buffer overflow in exec.c:hashcmd()

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MEDIUM

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

Published Mar 9, 2018

5.5

MEDIUM

CVSS 3.1

EPSS 0.43%

Description

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.

Affected products

Vendor Zsh Product Zsh Default
n/a
- Version
  5.4.2
  Status
  affected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Zsh

n/a

Version	Status	Constraints
5.4.2	affected	-

Red Hat Enterprise Linux 7

zsh-0:5.0.2-31.el7

Fixed · RHSA-2018:3073
Red Hat Enterprise Linux 5

zsh

Will not fix
Red Hat Enterprise Linux 6

zsh

Will not fix
Red Hat Enterprise Linux 8

zsh

Not affected

Product	Package	State	Advisory
Red Hat Enterprise Linux 7	zsh-0:5.0.2-31.el7	Fixed	RHSA-2018:3073
Red Hat Enterprise Linux 5	zsh	Will not fix	n/a
Red Hat Enterprise Linux 6	zsh	Will not fix	n/a
Red Hat Enterprise Linux 8	zsh	Not affected	n/a

Remediation

No remediation recorded yet.

Metrics

0.43% 0.00428

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.00428

Score over time

2021–2026

EPSS v1
EPSS v5
EPSS v2
EPSS v3
EPSS v4

Percentile over time

EPSS v1
EPSS v5
EPSS v2
EPSS v3
EPSS v4

Table of values (9 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	0.43% (0.00428)	34.68th	v5 (v2026.06.15)
Jun 15, 2026	0.45% (0.00446)	35.32th	v5 (v2026.06.15)
Mar 17, 2025	0.06% (0.00063)	17.04th	v4 (v2025.03.14)
Dec 12, 2024	0.04% (0.00042)	5.07th	v3 (v2023.03.01)
Mar 7, 2023	0.04% (0.00042)	5.63th	v3 (v2023.03.01)
Mar 6, 2023	1.03% (0.01034)	41.69th	v2 (v2022.01.01)
Feb 4, 2022	1.03% (0.01034)	20.32th	v2 (v2022.01.01)
Feb 3, 2022	1.10% (0.01105)	29.08th	v5 (v2026.06.15)
Apr 14, 2021	1.10% (0.01105)	0.00th	v1

Weaknesses (2)

CWE-121

CWE-787

Out-of-bounds Write

References (10)

http://www.securityfocus.com/bid/103359
vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2018:3073
vendor-advisoryx_refsource_REDHATThird Party Advisory
https://access.redhat.com/security/cve/CVE-2018-1071
Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1553531
x_refsource_CONFIRMIssue TrackingThird Party Advisory
https://lists.debian.org/debian-lts-announce/2018/03/msg00038.html
mailing-listx_refsource_MLISTMailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/12/msg00000.html
mailing-listx_refsource_MLIST
https://nvd.nist.gov/vuln/detail/CVE-2018-1071
https://security.gentoo.org/glsa/201805-10
vendor-advisoryx_refsource_GENTOOThird Party Advisory
https://usn.ubuntu.com/3608-1/
vendor-advisoryx_refsource_UBUNTUThird Party Advisory
https://www.cve.org/CVERecord?id=CVE-2018-1071

Link	Providers	Tags
http://www.securityfocus.com/bid/103359		vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2018:3073		vendor-advisoryx_refsource_REDHATThird Party Advisory
https://access.redhat.com/security/cve/CVE-2018-1071		Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1553531		x_refsource_CONFIRMIssue TrackingThird Party Advisory
https://lists.debian.org/debian-lts-announce/2018/03/msg00038.html		mailing-listx_refsource_MLISTMailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/12/msg00000.html		mailing-listx_refsource_MLIST
https://nvd.nist.gov/vuln/detail/CVE-2018-1071
https://security.gentoo.org/glsa/201805-10		vendor-advisoryx_refsource_GENTOOThird Party Advisory
https://usn.ubuntu.com/3608-1/		vendor-advisoryx_refsource_UBUNTUThird Party Advisory
https://www.cve.org/CVERecord?id=CVE-2018-1071