Disclosure summary
msgpack-c Integer Overflow in msgpack_unpacker_expand_buffer Causes a False-Success Undersized Reservation
Source-reported weakness categories
CWE-190
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 Sep 24, 2026
msgpack-c Integer Overflow in msgpack_unpacker_expand_buffer Causes a False-Success Undersized Reservation
Maximum of vendor-reported product scores; products and fixed builds are associations, not a universal affected-version statement.
Microsoft maximum product score: 5.3
| Vendor | Product / association | Version / bounds |
|---|---|---|
| Microsoft update guide | azl3 fluent-bit 3.1.10-6 on Azure Linux 3.0 | (MSRC status code 3) |
| Microsoft update guide | azl3 lttng-tools 2.13.11-1 on Azure Linux 3.0 | (MSRC status code 3) |
| Microsoft update guide | azl3 msgpack 3.3.0-1 on Azure Linux 3.0 | (MSRC status code 3) |
| Microsoft update guide | azl3 fluent-bit 3.1.10-7 on Azure Linux 3.0 | (MSRC status code 3) |
Vendor remediation references
- Release Notes · product IDs 21756-17084, 21665-17084, 21898-17084
- Vendor guidance · product IDs 21756-17084, 21665-17084, 21898-17084
Original records & references
- NIST NVD record
- CVE Program record
- msrc.microsoft.com — Vendor advisory
PUBLISHED 2026-08-24T21:04:54-04:00
MODIFIED 2026-09-24T22:29:29-04:00
INGESTED 2026-10-08T12:35:48-04:00