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CVE-2026-79772— Nokogiri before 1.19.1 Unchecked Return Value canonicalize

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 1.19.1之前版本存在异常处理不当漏洞，该漏洞源于未检查xmlC14NExecute返回值，失败时返回空字符串而非抛出异常，攻击者可通过提供无效的规范化XML绕过下游SAML库的签名验证。

CVSS 5.3 · Medium EPSS 0.34% · P26

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
sparklemotion nokogiri 1.5.1< 1.19.1 affected
1.19.1 unaffected
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I. Basic Information for CVE-2026-79772

Vulnerability Information
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Vulnerability Title
Nokogiri before 1.19.1 Unchecked Return Value canonicalize
Source: CVE Program / CVE List V5
Vulnerability Description
Nokogiri versions before 1.19.1 fail to check the return value from xmlC14NExecute in the canonicalize method, returning an empty string on failure instead of raising an exception. Attackers can exploit this to bypass signature validation in downstream SAML libraries by providing invalid canonicalized XML that is incorrectly accepted as valid.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
未加检查的返回值
Source: CVE Program / CVE List V5
Vulnerability Title
Sparkle Motion Nokogiri 异常处理不当漏洞
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 1.19.1之前版本存在异常处理不当漏洞，该漏洞源于未检查xmlC14NExecute返回值，失败时返回空字符串而非抛出异常，攻击者可通过提供无效的规范化XML绕过下游SAML库的签名验证。
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 1.5.1 ~ 1.19.1 -

II. Public POCs for CVE-2026-79772

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III. Intelligence Information for CVE-2026-79772

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Vendor Advisories for CVE-2026-79772 (1)

Other References for CVE-2026-79772 (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-2026-79769 5.5 MEDIUM Nokogiri before 1.19.4 Invalid Memory Read via initialize_copy_with_args
CVE-2026-79771 5.3 MEDIUM Nokogiri before 1.19.3 Memory Leak via XSLT Transform

IV. Related Vulnerabilities

Same product: nokogiri
Same vendor: sparklemotion
Same weakness: CWE-252

V. Comments for CVE-2026-79772

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