Disclosure summary
SymCrypt SymCryptXmssSign function - Heap overflow via 64->32-bit leaf-count truncation
Source-reported weakness categories
CWE-122
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-Apr
Open original source · Updated Sep 24, 2026
SymCrypt SymCryptXmssSign function - Heap overflow via 64->32-bit leaf-count truncation
Maximum of vendor-reported product scores; products and fixed builds are associations, not a universal affected-version statement.
Microsoft maximum product score: 6.1
| Vendor | Product / association | Version / bounds |
|---|---|---|
| Microsoft update guide | azl3 SymCrypt 103.8.0-1 on Azure Linux 3.0 | (MSRC status code 3) |
Vendor remediation references
- Release Notes · product IDs 21216-17084
- Vendor guidance · product IDs 21216-17084
Original records & references
- NIST NVD record
- CVE Program record
- msrc.microsoft.com — Vendor advisory
PUBLISHED 2026-04-16T21:02:11-04:00
MODIFIED 2026-09-24T21:47:57-04:00
INGESTED 2026-10-08T12:45:03-04:00