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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.

Nokogiri 1.19.3 之前的版本在 CSS 选择器词法分析器中存在正则表达式拒绝服务漏洞，影响字符串字面量和标识符的词法分析。攻击者可以通过向 Node#css、Node#at_css 和 Searchable#search 等方法注入特制的 CSS 选择器，引发指数级的正则表达式回溯，从而导致拒绝服务。

CVSS 7.5 · High

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

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 Premium
Qwen3.6-35B-A3B · 31404 chars
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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 · 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-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-2026-79769 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
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-1333

V. Comments for CVE-2026-79770

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