Disclosure summary
libexpat in Expat before 2.7.2 allows attackers to trigger large dynamic memory allocations via a small document that is submitted for parsing.
Source-reported weakness categories
CWE-770
Source-specific records & product guidance
Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.
Microsoft Security Updates (CVRF) · 2025-Sep
Open original source · Updated Sep 15, 2025
libexpat in Expat before 2.7.2 allows attackers to trigger large dynamic memory allocations via a small document that is submitted for parsing.
Maximum of vendor-reported product scores; products and fixed builds are associations, not a universal affected-version statement.
Microsoft maximum product score: 7.5
| Vendor | Product / association | Version / bounds |
|---|---|---|
| Microsoft update guide | cbl2 expat 2.6.4-2 on CBL Mariner 2.0 | (MSRC status code 3) |
| Microsoft update guide | azl3 expat 2.6.4-2 on Azure Linux 3.0 | (MSRC status code 3) |
| Microsoft update guide | azl3 expat 2.6.4-1 on Azure Linux 3.0 | (MSRC status code 3) |
| Microsoft update guide | cbl2 expat 2.6.4-1 on CBL Mariner 2.0 | (MSRC status code 3) |
Vendor remediation references
- CBL-Mariner Releases · build 2.6.4-2 · product IDs 20543-17086, 20572-17084, 17470-17084, 20210-17086
- Vendor guidance · product IDs 20543-17086, 20572-17084, 17470-17084, 20210-17086
Original records & references
- NIST NVD record
- CVE Program record
- msrc.microsoft.com — Vendor advisory
PUBLISHED 2025-09-15T21:01:15-04:00
MODIFIED 2025-09-15T21:01:15-04:00
INGESTED 2026-10-08T12:45:41-04:00