CVE-2021-30560 Nokogiri has vulnerable dependencies on libxml2 and libxslt

What is CVE-2021-30560?

CVE-2021-30560 is a high-severity use after free vulnerability in Debian Debian Linux, published on 3 Aug 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

Use after free in Blink XSLT in Google Chrome prior to 91.0.4472.164 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

Weakness: CWE-416

Which versions are affected by CVE-2021-30560?

2 open source packages ship an affected version, including nokogiri. It affects 4 products.

Products include Debian Debian Linux, Google Chrome, Splunk Universal Forwarder, Xmlsoft Libxslt.

How do I fix CVE-2021-30560?

Upgrade nokogiri to 1.13.2 or later.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2021-30560 being exploited?

There is no known exploitation of CVE-2021-30560 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-2021-30560, AZL-9735, CLEANSTART-2024-LT27910, CLEANSTART-2026-DT55361, CLSA-2025-1761056432, CLSA-2026-1776764746 and 11 more.