CVE-2019-16892: In Rubyzip before 1.3.0, a crafted ZIP file can bypass application checks on ZIP entry sizes because data abou

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MEDIUM 5.5WATCHLISTUPGRADEMITIGATEDOWNGRADE

CVE-2019-16892 is a medium-severity flaw (CVSS 5.5) affecting rubyzip, fedora, cloudforms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In Rubyzip before 1.3.0, a crafted ZIP file can bypass application checks on ZIP entry sizes because data about the uncompressed size can be spoofed. This allows attackers to cause a denial of service (disk consumption).

Why this priority

Public exploit reference
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.6% (top 25%)
CISA exploited list	No
Published	2019-09-25
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: fedoraproject · redhat · rubyzip project

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

Am I affected?

Timeline

2019-09-25 22:15 UTCPublished CVE record published
2026-06-17 02:22 UTCUpdated Record last modified

rubyzip project rubyzip UPGRADE

Affected: < 1.3.0

Fixed in: 1.3.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 1.3.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade rubyzip

Note

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

fedoraproject fedora MITIGATE

Affected: 29 · 30 · 31

Fixed in: no fixed release known

Safe to downgrade to: a release before 29

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

redhat cloudforms DOWNGRADE

Affected: 4.7 · 5.11

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.7

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 4.7 (Debian / Ubuntu)

apt-cache madison cloudforms sudo apt install cloudforms=<VERSION_BEFORE_4.7> sudo apt-mark hold cloudforms

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

dnf --showduplicates list cloudforms sudo dnf downgrade cloudforms-<VERSION_BEFORE_4.7> sudo dnf versionlock add cloudforms

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-2019-16892?

rubyzip: upgrade to 1.3.0; fedora: mitigate or apply the listed mitigation; cloudforms: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-16892 being exploited?

CVE-2019-16892 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-2019-16892 affect?

CVE-2019-16892 affects rubyzip, fedora, cloudforms. Severity is medium (CVSS 5.5). In Rubyzip before 1.3.0, a crafted ZIP file can bypass application checks on ZIP entry sizes because data about the uncompressed size can be spoofed. This allows attackers to cause a denial of service (disk consumption).

How urgent is CVE-2019-16892?

Priority 48/100. Public exploit reference; On your watchlist

Related CVEs

CVE-2018-1000544 CRITICAL 9.8 UPGRADE MITIGATE rubyzip gem rubyzip version 1.2.1 and earlier contains a Directory Traversal vulnerability in Zip::File compon

References

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