CVE-2018-1000035: A heap-based buffer overflow exists in Info-Zip UnZip version <= 6.00 in the processing of password-protected

Q: How do I fix CVE-2018-1000035?

unzip: upgrade to newer than 6.00. Exact commands for each OS are on this page.

Q: Is CVE-2018-1000035 being exploited?

CVE-2018-1000035 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2018-1000035 affect?

CVE-2018-1000035 affects unzip. Severity is high (CVSS 7.8). A heap-based buffer overflow exists in Info-Zip UnZip version <= 6.00 in the processing of password-protected archives that allows an attacker to perform a denial of service or to possibly achieve code execution.

Q: How urgent is CVE-2018-1000035?

Priority 52/100. High severity; EPSS top 2%: very likely to be exploited

This week

HIGH 7.8UPGRADE

CVE-2018-1000035 is a high-severity flaw (CVSS 7.8) affecting unzip. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A heap-based buffer overflow exists in Info-Zip UnZip version <= 6.00 in the processing of password-protected archives that allows an attacker to perform a denial of service or to possibly achieve code execution.

Why this priority

High severity
EPSS top 2%: very likely to be exploited

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	30.1% (top 2%)
CISA exploited list	No
Weakness	CWE-787
Published	2018-02-09
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: unzip project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2018-02-09 23:29 UTCPublished CVE record published
2026-06-17 01:32 UTCUpdated Record last modified

unzip project unzip UPGRADE

Affected: <= 6.00

Fixed in: newer than 6.00

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy unzip || rpm -q unzip || unzip --version

2. UPGRADE to newer than 6.00 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade unzip

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade unzip

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2018-1000035?

unzip: upgrade to newer than 6.00. Exact commands for each OS are on this page.

Is CVE-2018-1000035 being exploited?

CVE-2018-1000035 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2018-1000035 affect?

CVE-2018-1000035 affects unzip. Severity is high (CVSS 7.8). A heap-based buffer overflow exists in Info-Zip UnZip version <= 6.00 in the processing of password-protected archives that allows an attacker to perform a denial of service or to possibly achieve code execution.

How urgent is CVE-2018-1000035?

Priority 52/100. High severity; EPSS top 2%: very likely to be exploited

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References

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