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CVE-2026-79769— Nokogiri before 1.19.4 Invalid Memory Read via initialize_copy_with_args

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.

Nokogiri 1.19.4 之前的版本存在一个潜在的无效（越界）内存读取问题。该问题出现在受保护的内部方法 中，此方法被 和 所调用。该方法在将源参数解包为 时未进行类型检查。如果应用程序代码使用非 类型的参数（例如 ）调用此受保护方法，会导致从越界位置读取 数据，从而引发程序崩溃。 此漏洞仅由编程错误触发，无法通过不可信输入或正常使用公共 API 来利用。该问题仅影响 CRuby 实现。在版本 1.19.4 中，已添加类型检查，并在检测到错误类型时抛出 。

CVSS 5.5 · Medium

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 2

VendorProduct Version RangeStatus
sparklemotion nokogiri < 1.19.4 affected
1.19.4 unaffected
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I. Basic Information for CVE-2026-79769

Vulnerability Information
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Vulnerability Title
Nokogiri before 1.19.4 Invalid Memory Read via initialize_copy_with_args
Source: CVE Program / CVE List V5
Vulnerability Description
Nokogiri versions before 1.19.4 contain a possible invalid (out-of-bounds) memory read in the protected internal Node#initialize_copy_with_args helper behind Node#dup and #clone, which unwrapped its source argument as an xmlNode without a type check. If application code calls this protected method with a non-Node argument (e.g., a Namespace), it reads an xmlNs out of bounds, crashing the process. This is only triggerable by a programming error and cannot be triggered by untrusted input or normal use of the public API. Only CRuby is affected. Version 1.19.4 adds a type check and raises TypeError.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
使用不兼容类型访问资源(类型混淆)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
sparklemotion nokogiri 0 ~ 1.19.4 -

II. Public POCs for CVE-2026-79769

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III. Intelligence Information for CVE-2026-79769

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Vendor Advisories for CVE-2026-79769 (1)

Other References for CVE-2026-79769 (1)

Same Patch Batch · sparklemotion · 2026-08-25 · 14 CVEs total

CVE-2024-58378 9.8 CRITICAL Nokogiri before 1.16.2 Use-After-Free via xmlTextReader
CVE-2022-51000 9.8 CRITICAL Nokogiri before 1.13.2 Multiple Vulnerabilities via libxml2 libxslt
CVE-2025-71407 9.8 CRITICAL Nokogiri before 1.18.3 Stack Buffer Overflow and Use-After-Free
CVE-2022-50999 8.6 HIGH Nokogiri before 1.13.5 Integer Overflow via libxml2
CVE-2025-71406 7.8 HIGH Nokogiri before 1.18.4 Use-After-Free via libxslt
CVE-2023-54354 7.5 HIGH Nokogiri before 1.14.3 Null Pointer Dereference via libxml2
CVE-2026-79770 7.5 HIGH Nokogiri before 1.19.3 ReDoS via CSS selector tokenizer
CVE-2022-50998 7.5 HIGH Nokogiri before 1.13.9 Multiple Vulnerabilities via libxml2
CVE-2021-47996 7.5 HIGH Nokogiri before 1.11.4 Multiple Vulnerabilities via libxml2
CVE-2026-79771 5.3 MEDIUM Nokogiri before 1.19.3 Memory Leak via XSLT Transform
CVE-2026-79772 5.3 MEDIUM Nokogiri before 1.19.1 Unchecked Return Value canonicalize
CVE-2025-71346 2.9 LOW Nokogiri before 1.18.8 Heap Buffer Under-read via XML Schema
CVE-2024-58377 Nokogiri before 1.16.5 libxml2 Dependency Update

IV. Related Vulnerabilities

Same product: nokogiri
Same vendor: sparklemotion
Same weakness: CWE-843

V. Comments for CVE-2026-79769

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