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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.

Sparkle Motion Nokogiri是Sparkle Motion组织的一款解析HTML与XML的开发框架。 Sparkle Motion Nokogiri 1.19.4之前版本存在缓冲区错误漏洞，该漏洞源于Node#initialize_copy_with_args对源参数缺少类型检查，可能导致越界内存读取，进而导致进程崩溃。

CVSS 5.5 · Medium EPSS 0.31% · P22

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
Vulnerability Title
Sparkle Motion Nokogiri 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Sparkle Motion Nokogiri是Sparkle Motion组织的一款解析HTML与XML的开发框架。 Sparkle Motion Nokogiri 1.19.4之前版本存在缓冲区错误漏洞，该漏洞源于Node#initialize_copy_with_args对源参数缺少类型检查，可能导致越界内存读取，进而导致进程崩溃。
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 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 · 4 CVEs total

CVE-2026-79770 7.5 HIGH Nokogiri before 1.19.3 ReDoS via CSS selector tokenizer
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

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-79769

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