CVE-2026-57236
Nokogiri: Possible Use-After-Free when `Nokogiri::XML::Document#encoding=` raises an exception
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-416 |
| Vendor | sparklemotion |
| Product | nokogiri |
| Published | Jun 25, 2026 |
| Last Updated | Jun 25, 2026 |
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Affected Versions
sparklemotion / nokogiri
< 1.19.4