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CVE-2025-71346— Nokogiri before 1.18.8 Heap Buffer Under-read via XML Schema

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 1.18.8 之前的版本打包了存在漏洞的 libxml2 版本（低于 2.13.8），该版本在 xmlschemas.c 的 xmlSchemaIDCFillNodeTables 函数中包含一个基于堆的缓冲区下读漏洞（CVE-2025-32415）。当针对不受信任的 XML Schema 进行验证时，或在针对使用 xsd:keyref 与递归定义的、并带有额外身份约束类型的受信任 Schema 验证不受信任的文档时，可能会触发此问题。上游机构和 MITRE 均将该问题评级为低严重程度。

CVSS 2.9 · Low

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
sparklemotion nokogiri < 1.18.8 affected
1.18.8 unaffected
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I. Basic Information for CVE-2025-71346

Vulnerability Information
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Vulnerability Title
Nokogiri before 1.18.8 Heap Buffer Under-read via XML Schema
Source: CVE Program / CVE List V5
Vulnerability Description
Nokogiri before 1.18.8 packages a vulnerable version of libxml2 (before 2.13.8) that contains a heap-based buffer under-read (CVE-2025-32415) in the xmlSchemaIDCFillNodeTables function in xmlschemas.c. The issue can be triggered when validating against an untrusted XML Schema, or when validating untrusted documents against trusted schemas that use xsd:keyref in combination with recursively defined types that have additional identity constraints. Upstream and MITRE rate this issue as low severity.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
sparklemotion nokogiri 0 ~ 1.18.8 -

II. Public POCs for CVE-2025-71346

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III. Intelligence Information for CVE-2025-71346

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Vendor Advisories for CVE-2025-71346 (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-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-2026-79769 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-2024-58377 Nokogiri before 1.16.5 libxml2 Dependency Update

IV. Related Vulnerabilities

Same product: nokogiri
Same vendor: sparklemotion
Same weakness: CWE-125

V. Comments for CVE-2025-71346

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