CVE-2006-4334: Unspecified vulnerability in gzip 1.3.5 allows context-dependent attackers to cause a denial of service (crash

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MEDIUM 5.0DOWNGRADE

CVE-2006-4334 is a medium-severity flaw (CVSS 5.0) affecting gzip. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Unspecified vulnerability in gzip 1.3.5 allows context-dependent attackers to cause a denial of service (crash) via a crafted GZIP (gz) archive, which results in a NULL dereference.

Why this priority

EPSS top 9%: very likely to be exploited

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	4.2% (top 9%)
CISA exploited list	No
Published	2006-09-19
Last modified	2026-06-16

Publisher (CNA): Red Hat, Inc. · Vendor: gzip

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2006-09-19 21:07 UTCPublished CVE record published
2026-06-16 22:28 UTCUpdated Record last modified

gzip gzip DOWNGRADE

Affected: 1.3.5

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.3.5

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.3.5 (Debian / Ubuntu)

apt-cache madison gzip sudo apt install gzip=<VERSION_BEFORE_1.3.5> sudo apt-mark hold gzip

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list gzip sudo dnf downgrade gzip-<VERSION_BEFORE_1.3.5> sudo dnf versionlock add gzip

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2006-4334?

gzip: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2006-4334 being exploited?

CVE-2006-4334 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-2006-4334 affect?

CVE-2006-4334 affects gzip. Severity is medium (CVSS 5.0). Unspecified vulnerability in gzip 1.3.5 allows context-dependent attackers to cause a denial of service (crash) via a crafted GZIP (gz) archive, which results in a NULL dereference.

How urgent is CVE-2006-4334?

Priority 40/100. EPSS top 9%: very likely to be exploited

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References

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