Disclosure summary
Mbed TLS before 2.28.10 and 3.x before 3.6.3, in some cases of failed memory allocation or hardware errors, uses uninitialized stack memory to compose the TLS Finished message, potentially leading to authentication bypasses such as replays.
Source-reported weakness categories
CWE-908
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-Mar
Open original source · Updated Aug 12, 2026
Mbed TLS before 2.28.10 and 3.x before 3.6.3, in some cases of failed memory allocation or hardware errors, uses uninitialized stack memory to compose the TLS Finished message, potentially leading to authentication bypasses such as replays.
Maximum of vendor-reported product scores; products and fixed builds are associations, not a universal affected-version statement.
Microsoft maximum product score: 5.4
| Vendor | Product / association | Version / bounds |
|---|---|---|
| Microsoft update guide | cbl2 qemu 6.2.0-24 on CBL Mariner 2.0 | (MSRC status code 3) |
| Microsoft update guide | cbl2 qemu 6.2.0-24 on CBL Mariner 2.0 | (MSRC status code 3) |
| Microsoft update guide | cbl2 qemu 6.2.0-24 on CBL-Mariner 2.0 | (MSRC status code 3) |
| Microsoft update guide | azl3 qemu 8.2.0-16 on Azure Linux 3.0 | (MSRC status code 3) |
Original records & references
- NIST NVD record
- CVE Program record
- msrc.microsoft.com — Vendor advisory
PUBLISHED 2025-09-03T18:17:37-04:00
MODIFIED 2026-08-12T17:58:53-04:00
INGESTED 2026-10-08T12:50:10-04:00