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CVE-2026-57437— Nokogiri: Possible Use-After-Free when directly using `NokogirI::XML::XPathContext` beyond document lifetime

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之前版本存在资源管理错误漏洞，该漏洞源于释放后重用，可能导致读取无效内存并潜在导致段错误。

AI Predicted 5.3 Difficulty: Hard EPSS 0.32% · P25

Affected Version Matrix 1

VendorProduct Version RangeStatus
sparklemotion nokogiri < 1.19.4 affected
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I. Basic Information for CVE-2026-57437

Vulnerability Information
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Vulnerability Title
Nokogiri: Possible Use-After-Free when directly using `NokogirI::XML::XPathContext` beyond document lifetime
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, Nokogiri::XML::XPathContext did not keep its source document alive for garbage collection. If an XPathContext outlived its document and the document was collected, evaluating an XPath expression could read invalid memory and potentially segfault. This is only reachable when application code constructs an XPathContext directly and lets the document become unreachable while continuing to use the context. The normal Document#xpath, #css, and related search methods are not affected, and it is not triggerable by malicious document input. This vulnerability is fixed in 1.19.4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
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之前版本存在资源管理错误漏洞，该漏洞源于释放后重用，可能导致读取无效内存并潜在导致段错误。
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-2026-57437

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III. Intelligence Information for CVE-2026-57437

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Other References for CVE-2026-57437 (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-2026-57438 Nokogiri: Possible Use-After-Free in XInclude Processing
CVE-2026-57236 Nokogiri: Possible Use-After-Free when `Nokogiri::XML::Document#encoding=` raises an excep
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-2026-57437

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