Disclosure summary
In Mbed TLS through 4.0.0, there is a compiler-induced timing side channel (in RSA and CBC/ECB decryption) that only occurs with LLVM's select-optimize feature. TF-PSA-Crypto through 1.0.0 is also affected.
Source-reported weakness categories
CWE-385
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 02, 2026
In Mbed TLS through 4.0.0, there is a compiler-induced timing side channel (in RSA and CBC/ECB decryption) that only occurs with LLVM's select-optimize feature. TF-PSA-Crypto through 1.0.0 is also affected.
Maximum of vendor-reported product scores; products and fixed builds are associations, not a universal affected-version statement.
Microsoft maximum product score: 5.1
| Vendor | Product / association | Version / bounds |
|---|---|---|
| Microsoft update guide | azl3 qemu 10.1.0-1 on Azure Linux 3.0 | (MSRC status code 3) |
Vendor remediation references
- Vendor guidance · product IDs 21780-17084
- Vendor guidance · product IDs 21780-17084
Original records & references
- NIST NVD record
- CVE Program record
- msrc.microsoft.com — Vendor advisory
PUBLISHED 2026-05-06T21:13:04-04:00
MODIFIED 2026-09-02T21:07:43-04:00
INGESTED 2026-10-08T12:45:06-04:00