Disclosure summary
libexpat before 2.8.3 has an out-of-bounds read and resultant infinite loop because low surrogates are treated the same as high surrogates during Unicode processing in the *_toUtf16 functions.
Source-reported weakness categories
CWE-125
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) · 2026-Aug
Open original source · Updated Aug 23, 2026
libexpat before 2.8.3 has an out-of-bounds read and resultant infinite loop because low surrogates are treated the same as high surrogates during Unicode processing in the *_toUtf16 functions.
Maximum of vendor-reported product scores; products and fixed builds are associations, not a universal affected-version statement.
Microsoft maximum product score: 6.2
| Vendor | Product / association | Version / bounds |
|---|---|---|
| Microsoft update guide | azl3 expat 2.8.2-1 on Azure Linux 3.0 | (MSRC status code 3) |
Vendor remediation references
- CBL-Mariner Releases · build 2.8.3-1 · product IDs 21698-17084
- Vendor guidance · product IDs 21698-17084
Original records & references
- NIST NVD record
- CVE Program record
- msrc.microsoft.com — Vendor advisory
PUBLISHED 2026-08-10T21:08:47-04:00
MODIFIED 2026-08-23T10:46:59-04:00
INGESTED 2026-10-08T12:35:48-04:00