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CVE-2026-57438— Nokogiri: Possible Use-After-Free in XInclude Processing

Quick assessment

Affected
sparklemotion nokogiri
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Sparkle Motion Nokogiri是Sparkle Motion个人开发者的一个HTML、XML和SAX解析库。 Sparkle Motion Nokogiri 1.19.4版本之前版本存在资源管理错误漏洞，该漏洞源于XInclude替换时释放已用内存，可能导致使用已释放内存的对象，造成无效的内存读取或写入。

AI Predicted 6.5 Difficulty: Moderate EPSS 0.12% · P2

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
sparklemotion nokogiri < 1.19.4 affected
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I. Basic Information for CVE-2026-57438

Vulnerability Information
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Vulnerability Title
Nokogiri: Possible Use-After-Free in XInclude Processing
Source: CVE Program / CVE List V5
Vulnerability Description
Nokogiri is an open source XML and HTML library for the Ruby programming language. Prior to 1.19.4, XInclude substitution performed by Nokogiri::XML::Node#do_xinclude replaced each <xi:include> in place, freeing the include node along with its children (such as <xi:fallback> and its descendants) and any namespaces declared on them. If an application had already exposed one of those nodes or namespaces to Ruby, the corresponding Ruby object was left pointing at freed memory. Using the object could result in invalid reads or writes to memory. This vulnerability is fixed in 1.19.4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N/E:U
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
Sparkle Motion Nokogiri 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Sparkle Motion Nokogiri是Sparkle Motion个人开发者的一个HTML、XML和SAX解析库。 Sparkle Motion Nokogiri 1.19.4版本之前版本存在资源管理错误漏洞，该漏洞源于XInclude替换时释放已用内存，可能导致使用已释放内存的对象，造成无效的内存读取或写入。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
sparklemotion nokogiri < 1.19.4 -

II. Public POCs for CVE-2026-57438

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III. Intelligence Information for CVE-2026-57438

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Vendor Advisories for CVE-2026-57438 (1)

Same Patch Batch · sparklemotion · 2026-06-25 · 8 CVEs total

CVE-2026-57234 2.6 LOW Nokogiri: XML::Schema on JRuby allows network requests when NONET is set, bypassing CVE-20
CVE-2026-57236 Nokogiri: Possible Use-After-Free when `Nokogiri::XML::Document#encoding=` raises an excep
CVE-2026-57437 Nokogiri: Possible Use-After-Free when directly using `NokogirI::XML::XPathContext` beyond
CVE-2026-57235 Nokogiri: Possible Out-of-Bounds Read in `Nokogiri::XML::NodeSet#[]`
CVE-2026-57436 Nokogiri: Possible Use-After-Free when setting `Document#root=` to an invalid node type
CVE-2026-57435 Nokogiri: Possible Use-After-Free when setting an attribute value via `Nokogiri::XML::Attr
CVE-2026-57434 Nokogiri: Null Pointer Dereference calling methods on uninitialized wrapper classes

IV. Related Vulnerabilities

Same product: nokogiri
Same vendor: sparklemotion
Same weakness: CWE-416

V. Comments for CVE-2026-57438

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