CVE-2025-24928
📋 TL;DR
This CVE describes a stack-based buffer overflow vulnerability in libxml2's xmlSnprintfElements function. Attackers can exploit this by providing malicious XML documents with DTD validation enabled, potentially leading to arbitrary code execution. Any application using vulnerable libxml2 versions for XML parsing with DTD validation is affected.
💻 Affected Systems
- libxml2
- Any software/library using libxml2 (e.g., PHP, Python, Perl, C/C++ applications)
📦 What is this software?
Libxml2 by Xmlsoft
Libxml2 by Xmlsoft
Manageability Software Development Kit by Netapp
View all CVEs affecting Manageability Software Development Kit →
Ontap by Netapp
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or ransomware deployment.
Likely Case
Application crash (denial of service) or limited information disclosure from memory corruption.
If Mitigated
No impact if DTD validation is disabled or proper input validation/sandboxing is implemented.
🎯 Exploit Status
Similar to CVE-2017-9047. Requires attacker to control XML input with DTD validation. No public exploits known as of analysis.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: libxml2 2.12.10, libxml2 2.13.6
Vendor Advisory: https://gitlab.gnome.org/GNOME/libxml2/-/issues/847
Restart Required: No
Instructions:
1. Update libxml2 to patched version via package manager (apt/yum/brew). 2. Recompile applications using libxml2. 3. Test XML parsing functionality.
🔧 Temporary Workarounds
Disable DTD validation
allPrevent exploitation by disabling DTD validation in XML parsing configurations.
xmlSetFeature(parser, XML_WITH_DTD, 0); // C example
parser.setFeature('http://xml.org/sax/features/external-general-entities', false); // Java example
🧯 If You Can't Patch
- Implement strict input validation to reject XML with DTDs from untrusted sources.
- Use application sandboxing/containerization to limit impact of potential exploitation.
🔍 How to Verify
Check if Vulnerable:
Check libxml2 version: xml2-config --version or dpkg -l libxml2Check Version:
xml2-config --version || dpkg -l libxml2 | grep libxml2 || rpm -q libxml2Verify Fix Applied:
Confirm version is >=2.12.10 or >=2.13.6. Test XML parsing with DTD validation.📡 Detection & Monitoring
Log Indicators:
- Application crashes with segmentation faults in XML parsing
- Unusual XML document processing errors
Network Indicators:
- Incoming XML documents with complex DTD structures
- XML payloads triggering validation
SIEM Query:
source="application.log" AND ("segmentation fault" OR "xml parsing error") AND process="*xml*"