CVE-2026-8676

Bluetooth security downgrade via weak re-pairing

Published May 26, 2026 · Updated May 26, 2026

Authentication bypass in Silicon Labs Simplicity SDK before 2024.12.0 allows physically proximate attackers to downgrade Bluetooth LE security. During re-pairing, the Bluetooth LE stack accepts security properties weaker than those stored for the prior bond instead of requiring them to match or exceed the earlier pairing. Exploitation requires deletion of an existing bond, impersonation of the bonded device, and creation of a weaker replacement bond that reduces protection for subsequent device interactions.

CVSS severity8.8
High
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Silicon Labs Simplicity SDK before 2024.12.0 allows physically proximate attackers to downgrade Bluetooth LE security. During re-pairing, the Bluetooth LE stack accepts security properties weaker than those stored for the prior bond instead of requiring them to match or exceed the earlier pairing. Exploitation requires deletion of an existing bond, impersonation of the bonded device, and creation of a weaker replacement bond that reduces protection for subsequent device interactions.

The record

CVE
CVE-2026-8676
Published
May 26, 2026
Updated
May 26, 2026
Vendor
Sigma Designs
Product
Simplicity SDK
Classifications
CWE-290
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 26, 2026CVE publishedPublication date reported by the CVE source.
  2. May 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2024.12.0

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Sigma Designs · Simplicity SDKversion=0 <2024.12.0

Published CVSS scores

8.8Silicon LabsCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-290Authentication Bypass by Spoofing

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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