Vulnerability · Published Oct 22, 2026 · Assigned by Silabs
CVE-2026-66279Dis-connect vulnerability in Connect Stack
High 7.2
In plain English
A high-severity security flaw in Connect SDK from Silicon Labs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities).
Severity (CVSS 4.0)7.2High
Exploit odds (30 days)0.2%top 84.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
In Connect SDK 4.3.1 and earlier and Flex SDK 3.7.7 and earlier, a message with invalid security settings may bypass authentication resulting in network disruption. This vulnerability does not allow an attacker to gain the Network Key or otherwise break confidentiality.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Silicon Labs | Connect SDK | 4.0.0 – through 4.3.10 – through 3.7.7 |
Weakness: CWE-940 · Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
References
- https://github.com/SiliconLabsSoftware/docs-security-advisories/blob/main/Advisories/500-599/A-00000588.md vendor-advisory, permissions-required
- https://github.com/SiliconLabsSoftware/sisdk-release/ patch