Vulnerability · Published Jun 25, 2026 · Assigned by GitHub_M
CVE-2026-57434Nokogiri: Null Pointer Dereference calling methods on uninitialized wrapper classes
Low 1.7
In plain English
A low-severity null pointer dereference in nokogiri from sparklemotion. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 40% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | ruby-nokogiri | no fix listed | DEBIAN-CVE-2026-57434 |
| Debian:13 | ruby-nokogiri | no fix listed | DEBIAN-CVE-2026-57434 |
| Debian:14 | ruby-nokogiri | 1.19.4+dfsg-1 | DEBIAN-CVE-2026-57434 |
| RubyGems | nokogiri | 1.19.4 | GHSA-9cv2-cfxc-v4v2 |
| Ubuntu:24.04:LTS | ruby-nokogiri | no fix listed | UBUNTU-CVE-2026-57434 |
| Ubuntu:25.10 | ruby-nokogiri | no fix listed | UBUNTU-CVE-2026-57434 |
| Ubuntu:26.04:LTS | ruby-nokogiri | no fix listed | UBUNTU-CVE-2026-57434 |
| Ubuntu:26.10 | ruby-nokogiri | no fix listed | UBUNTU-CVE-2026-57434 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| sparklemotion | nokogiri | < 1.19.4 |
Weakness: CWE-476 · Vector: 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