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.
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Thu, 25 Jun 2026 16:30:00 +0000
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| Description | 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. | |
| Title | Nokogiri: Possible Use-After-Free when `Nokogiri::XML::Document#encoding=` raises an exception | |
| Weaknesses | CWE-416 | |
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-06-25T15:32:43.266Z
Reserved: 2026-06-24T02:21:33.812Z
Link: CVE-2026-57236
Updated: 2026-06-25T15:32:39.322Z
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OpenCVE Enrichment
Updated: 2026-06-25T15:45:05Z