What is CVE-2026-57236?

CVE-2026-57236 is a high-severity vulnerability in Nokogiri, classified under Use After Free. CVSS score: 8.2/10. Published 2026-06-25.

How severe is CVE-2026-57236?

High severity. CVSS v3 base score is 8.2 out of 10.

Use After Free in Nokogiri

CVE-2026-57236

Nokogiri is an open source XML and HTML library for the Ruby programming language. Prior to 1.19.4, calling Document#encoding= with an invalid encoding (e.g., a non-string, or a string containing a null byte) raises an exception, but only…

Vulnerability class: Use-After-Free

EPSS: 0.003 (26.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H.

Affected products

Nokogiri
Sparklemotion Nokogiri — versions < 1.19.4

Weakness classification (CWE)

CWE-416 — Use After Free

References

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

Frequently asked questions

What is CVE-2026-57236?: CVE-2026-57236 is a high-severity vulnerability in Nokogiri, classified under Use After Free. CVSS score: 8.2/10. Published 2026-06-25.
How severe is CVE-2026-57236?: High severity. CVSS v3 base score is 8.2 out of 10.