Sparklemotion Nokogiri up to 1.18.7 Schema Validation xmlschemas.c xmlSchemaIDCFillNodeTables heap-based overflow

Summaryinfo

A vulnerability was found in Sparklemotion Nokogiri up to 1.18.7. It has been rated as problematic. Affected by this vulnerability is the function xmlSchemaIDCFillNodeTables of the file xmlschemas.c of the component Schema Validation. The manipulation leads to heap-based overflow. This vulnerability is uniquely identified as CVE-2025-71346. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Sparklemotion Nokogiri up to 1.18.7 and classified as problematic. This issue affects the function xmlSchemaIDCFillNodeTables of the file xmlschemas.c of the component Schema Validation. The manipulation with an unknown input leads to a heap-based overflow vulnerability. Using CWE to declare the problem leads to CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). Impacted is availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2025-71346 since 06/20/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 1.18.8 eliminates this vulnerability.

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Productinfo

Vendor

• Sparklemotion

Name

• Nokogiri

Version

• 1.18.0
• 1.18.1
• 1.18.2
• 1.18.3
• 1.18.4
• 1.18.5
• 1.18.6
• 1.18.7

Website

• Product: https://github.com/sparklemotion/nokogiri/

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