CVE-2026-57434
Nokogiri: Null Pointer Dereference calling methods on uninitialized wrapper classes
EPSS 0.36%
Description
Nokogiri is an open source XML and HTML library for the Ruby programming language. Prior to 1.19.4, Nokogiri contains a bug when calling certain methods on allocated-but-uninitialized native wrapper classes that inherit from Nokogiri::XML::Node. This caused a NULL pointer dereference that could crash the process. This vulnerability is fixed in 1.19.4.
How to fix CVE-2026-57434
To remediate CVE-2026-57434, upgrade the affected package to a fixed version below.
- RubyGems/nokogiri—upgrade to 1.19.4 or later
Is CVE-2026-57434 being exploited?
Low — EPSS is 0.4%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 1.19.4
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U |