What is CVE-2026-57434?

CVE-2026-57434 is a high-severity vulnerability in Nokogiri, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2026-06-25.

How severe is CVE-2026-57434?

High severity. CVSS v3 base score is 7.5 out of 10.

NULL pointer dereference in Nokogiri

CVE-2026-57434

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…

EPSS: 0.004 (28.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Nokogiri
Sparklemotion Nokogiri — versions < 1.19.4

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

security-advisories@github.com (x_refsource_CONFIRM, Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2026-57434?: CVE-2026-57434 is a high-severity vulnerability in Nokogiri, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2026-06-25.
How severe is CVE-2026-57434?: High severity. CVSS v3 base score is 7.5 out of 10.