CVE-2024-56171

Description

libxml2 before 2.12.10 and 2.13.x before 2.13.6 has a use-after-free in xmlSchemaIDCFillNodeTables and xmlSchemaBubbleIDCNodeTables in xmlschemas.c. To exploit this, a crafted XML document must be validated against an XML schema with certain identity constraints, or a crafted XML schema must be used.

How to fix CVE-2024-56171

To remediate CVE-2024-56171, upgrade the affected package to a fixed version below.

• Alpine/libxml2—upgrade to 2.11.8-r1 or later
• —upgrade to 1.8.0 or later
• —upgrade to 1.8.0 or later
• —upgrade to 1.8.0 or later
• —upgrade to 2.9.10+dfsg-6.7+deb11u6 or later

Is CVE-2024-56171 being exploited?

Low — EPSS is 0.2%, meaning exploitation activity has not been observed at scale.

Affected packages (5)

• from 0, < 2.11.8-r1
• from 0, < 1.8.0, >= 1.9.0, < 8.0.461
• from 0, < 1.8.0, >= 1.9.0, < 8.0.461
• from 0, < 1.8.0, >= 1.9.0, < 8.0.461
• from 0, < 2.9.10+dfsg-6.7+deb11u6

CVSS scores

References (14)

• ADVISORYsecurity.alpinelinux.org/vuln/CVE-2024-56171
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2024-56171
• WEBseclists.org/fulldisclosure/2025/Apr/10
• WEBseclists.org/fulldisclosure/2025/Apr/11
• WEB