SymCrypt SymCryptXmssSign function - Heap overflow via 64->32-bit leaf-count truncation — CVE-2026-35199
Date
Source
MSRC
MSRC
Vendor
Microsoft
Microsoft
Threat
medium
medium
CVSS
6.1
6.1
Summary
Advisory CVE-2026-35199. SymCrypt SymCryptXmssSign function - Heap overflow via 64->32-bit leaf-count truncation Vendor: Microsoft. Source: MSRC. Threat: medium. CVSS 6.1. See the official advisory for details.
What to do
General, cautious steps (verify details in the official source):
- Review exposure and plan remediation based on risk and environment.
- Identify affected product versions in your inventory and verify whether you are impacted.
- Apply vendor patches/updates or recommended mitigations as soon as available.
- Read the official advisory for exact affected versions and remediation steps.