CVE-2018-1000637

zutils version prior to version 1.8-pre2 contains a Buffer Overflow vulnerability in zcat that...

7.8 HighFix available

zutils version prior to version 1.8-pre2 contains a Buffer Overflow vulnerability in zcat that can result in Potential denial of service or arbitrary code execution. This attack appear to be exploitable via the victim openning a crafted compressed file. This vulnerability appears to have been fixed in 1.8-pre2.

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: Low
Privileges needed: None
User interaction: Required

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

1.67%Down 0.1 points since Apr 14, 2021

What each source reports

NVD Score used 7.8

Record: CVE-2018-1000637
CVSS 3.0: 7.8 HighCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS 2.0: 6.8 MediumAV:N/AC:M/Au:N/C:P/I:P/A:P
Weakness: CWE-119
Updated: 2026-11-02

CVE List No score

Record: CVE-2018-1000637
Updated: 2026-11-02

EUVDEUVD-2018-1971 No score

Record: EUVD-2018-1971
Updated: 2026-11-03

GitHub AdvisoriesGHSA-px98-fj37-9hmp 7.8

zutils version prior to version 1.8-pre2 contains a Buffer Overflow vulnerability in zcat that...

Record: GHSA-px98-fj37-9hmp
CVSS 3.0: 7.8 HighCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness: CWE-119
Updated: 2026-11-02

OSV 7.8

Record: CVE-2018-1000637
CVSS 3.0: 7.8 HighCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVDEBIAN-CVE-2018-1000637 7.8

Record: DEBIAN-CVE-2018-1000637
CVSS 3.0: 7.8 HighCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2018-1000637 7.8

Record: UBUNTU-CVE-2018-1000637
CVSS 3.0: 7.8 HighCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`zutils` Debian:12	before 1.7-3	1.7-3
`zutils` Debian:13	before 1.7-3	1.7-3
`zutils` Debian:14	before 1.7-3	1.7-3
`zutils` Debian:8	before 1.3-4+deb8u1, plus listed versions 1.3-4	1.3-4+deb8u1
`zutils` Ubuntu:16.04:LTS	All versions, plus listed versions 1.4-1	None known
`zutils` Ubuntu:18.04:LTS	All versions, plus listed versions 1.6-31.6-41.6-51.6-61.7-1	None known

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2018-1000637 is a high vulnerability (CVSS 7.8) in Nongnu Zutils, published August 20, 2018. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.67%, the 76th percentile. Fixed in zutils 1.7-3.