CVE-2026-57236 — Nokogiri: Possible Use-After-Free when `Nokogiri::XML::Document#encoding=` raises an exception

Description (CNA)

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 after freeing the document's current encoding string without replacing it. The document is left referencing freed memory, so the next call to Document#encoding reads invalid memory, which can cause a segfault or leak freed bytes into a Ruby String. Affects the CRuby (libxml2) implementation only; JRuby is not affected. This vulnerability is fixed in 1.19.4.

Affected (CNA)

Vendor / product	Versions
sparklemotion / nokogiri	affected < 1.19.4

CWE

CWE-416

References

https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-5v8h-3h3q-446p

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.