CVE-2019-8321 RubyGems Escape sequence injection vulnerability in verbose

What is CVE-2019-8321?

CVE-2019-8321 is a high-severity vulnerability in Debian Debian Linux, published on 17 Jun 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An issue was discovered in RubyGems 2.6 and later through 3.0.2. Since Gem::UserInteraction#verbose calls say without escaping, escape sequence injection is possible.

Weakness: CWE-88

Which versions are affected by CVE-2019-8321?

4 open source packages ship an affected version, including rubygems-update. It affects 3 products.

Products include Debian Debian Linux, Opensuse Leap, Rubygems Rubygems.

How do I fix CVE-2019-8321?

Upgrade rubygems-update to a fixed version for your release line: 2.7.9 or 3.0.2.

Is CVE-2019-8321 being exploited?

There is no known exploitation of CVE-2019-8321 in the wild and no public exploit code.

Other vulnerabilities in Debian Debian Linux

• CVE-2015-3306 ProFTPD Improper Access Control Exploited Critical 10.0
• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as ALPINE-CVE-2019-8321, DEBIAN-CVE-2019-8321, GHSA-fr32-gr5c-xq5c, UBUNTU-CVE-2019-8321.