High · 8.7 CVE-2026-6924 EUVD-2026-48399GHSA-wm5h-r2qh-r97h

Weak entropy initialization in Silicon Labs Matter SiWx917 TinyCrypt path

Published Jul 23, 2026 · Updated Jul 24, 2026 · Assigned by Silabs

Vendor: Silicon Labs Product: Silicon Labs Matter Github

Description

A bug in the entropy initialization for SiWx917 causes the DRBG to use a predictable seed. As such, all random numbers generated in the Matter code use the same stream of numbers. This vulnerability was discovered after the impacted repository was already deprecated.

Affected products

Vendor	Product	Affected	Fixed
Silicon Labs	Silicon Labs Matter Github	—	—

References

https://siliconlabs.lightning.force.com/sfc/servlet.shepherd/document/download/a45Vm0000009SzZIAU?operationContext=S1 vendor-advisory permissions-required
https://github.com/SiliconLabs/matter/tree/release_2.3.1-1.3 patch