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

Quick assessment

Affected
sparklemotion nokogiri
Exploitation
Public or AI PoC available; prioritize validation
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 1.19.3之前版本存在资源管理错误漏洞，该漏洞源于CSS选择器tokenizer中正则表达式拒绝服务问题，可能导致攻击者注入恶意CSS选择器，造成正则表达式指数级回溯和拒绝服务。

CVSS 7.5 · High EPSS 0.49% · P41

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 2

VendorProduct Version RangeStatus
sparklemotion nokogiri < 1.19.3 affected
1.19.3 unaffected
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I. Basic Information for CVE-2026-79770

Vulnerability Information
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Vulnerability Title
Nokogiri before 1.19.3 ReDoS via CSS selector tokenizer
Source: CVE Program / CVE List V5
Vulnerability Description
Nokogiri versions before 1.19.3 contain regular expression denial of service vulnerabilities in the CSS selector tokenizer affecting string-literal and identifier tokenization. Attackers can inject adversarial CSS selectors into methods like Node#css, Node#at_css, and Searchable#search to cause exponential regex backtracking and denial of service.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1333
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组织的一款解析HTML与XML的开发框架。 Sparkle Motion Nokogiri 1.19.3之前版本存在资源管理错误漏洞，该漏洞源于CSS选择器tokenizer中正则表达式拒绝服务问题，可能导致攻击者注入恶意CSS选择器，造成正则表达式指数级回溯和拒绝服务。
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 ~ 1.19.3 -

II. Public POCs for CVE-2026-79770

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
Success marker: VULNERABLE: ReDoS confirmed — adversarial CSS selector took 4911.2 ms (threshold 2000ms); baseline 0.21 ms
Reproduction recording is a Pro+ exclusive
Watch the full sandbox build + live exploit recording for this CVE. Limited-time ¥499/mo.
Upgrade to Pro+
claude_code · 71315 chars
GitHub 复现环境（可 clone 直接跑）
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-79770

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Vendor Advisories for CVE-2026-79770 (2)

Same Patch Batch · sparklemotion · 2026-08-25 · 4 CVEs total

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
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-1333

V. Comments for CVE-2026-79770

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