High
ruby-nokogiri — security advisory
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.
- Products
- ruby-nokogiri
- Affected versions
- 1.10.3+dfsg1-2, 1.10.4+dfsg1-1, 1.10.7+dfsg1-1, 1.10.7+dfsg1-2, 1.10.7+dfsg1-2build1, 1.10.7+dfsg1-2ubuntu0.1~esm2, 1.11.1+dfsg-2ubuntu1, 1.11.7+dfsg-3, 1.11.7+dfsg-3build1, 1.13.1+dfsg-2, 1.13.1+dfsg-2ubuntu0.1~esm1, 1.14.3+dfsg-2, 1.16.2+dfsg-1, 1.16.2+dfsg-1build1, 1.16.4+dfsg-1build1, 1.18.10+dfsg-2, 1.18.10+dfsg-3, 1.18.2+dfsg-1build1, 1.19.1+dfsg-1, 1.19.3+dfsg-1, 1.19.4+dfsg-1, 1.5.9-2, 1.5.9-3, 1.6.0-1, 1.6.1+ds-1, 1.6.1+ds-1ubuntu0.1~esm1, 1.6.6.2+ds-2build2, 1.6.6.3-1, 1.6.7-1, 1.6.7.1-1, 1.6.7.2-3, 1.6.7.2-3build1, 1.6.7.2-3ubuntu0.1, 1.8.0-1, 1.8.1-1, 1.8.1-1build1, 1.8.2-1build1, 1.8.2-1ubuntu0.1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-57236
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:47 UTC · Revision 1
Source evidence
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.
osv:UBUNTU-CVE-2026-57236
ruby-nokogiri
Fixed versions: Not specified
ruby-nokogiri
Fixed versions: Not specified
ruby-nokogiri
Fixed versions: Not specified
ruby-nokogiri
Fixed versions: Not specified
ruby-nokogiri
Fixed versions: Not specified
ruby-nokogiri
Fixed versions: Not specified
ruby-nokogiri
Fixed versions: Not specified
ruby-nokogiri
Fixed versions: Not specified
ruby-nokogiri
Fixed versions: Not specified
Complete source record
{
"id": "a69385f6a457f406cc98266429f7013b34b379ddc6a4e6d875d8845f009f579f",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-57236",
"method": "structured",
"payload": {
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"title": "UBUNTU-CVE-2026-57236",
"summary": "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.",
"evidence": "osv:UBUNTU-CVE-2026-57236",
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{
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],
"modified": "2026-10-17T12:59:11.958633547Z",
"provider": "osv",
"upstream": [
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],
"references": [
"https://ubuntu.com/security/CVE-2026-57236",
"https://www.cve.org/CVERecord?id=CVE-2026-57236",
"https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-5v8h-3h3q-446p"
]
},
"related_cves": [
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"value": "CVE-2026-57236",
"evidence": "/upstream"
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],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 359417,
"published_at": "2026-06-25T15:16:00+00:00"
}