Low [CVE-2025-71346] Heap buffer under-read in XML Schema validation
This low-severity Red Hat Linux advisory covers CVE-2025-71346 affecting Red Hat 3scale API Management Platform 2, Red Hat Satellite 6.
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Summary
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.
This heap-based buffer under-read vulnerability, located in the xmlSchemaIDCFillNodeTables function, can be triggered when processing untrusted XML Schemas or documents. A remote attacker could exploit this by providing specially crafted XML input, which may lead to unexpected application behavior or a limited denial of service (DoS).
This flaw has a Low impact as it requires applications utilizing Nokogiri to process specially crafted, untrusted XML schemas or documents that include specific identity constraints. Exploitation is limited to scenarios where vulnerable applications perform XML validation on untrusted input, potentially leading to a denial of service.
Red Hat severity: Low — CVSS 2.9 (CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L). Weakness: CWE-125.
Affected Red Hat products: Red Hat 3scale API Management Platform 2; Red Hat Satellite 6.
- < 1.18.8
- < 2.13.8
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
Mitigation checklist
- No mitigation is currently available for this vulnerability. Red Hat recommends applying the appropriate security update as soon as it becomes available.
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
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