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CVE Vulnerability Details :
CVE-2026-8686
PUBLISHED
More InfoOfficial Page
Assigner-AMZN
Assigner Org ID-ff89ba41-3aa1-4d27-914a-91399e9639e5
View Known Exploited Vulnerability (KEV) details
Published At-15 May, 2026 | 18:38
Updated At-15 May, 2026 | 20:22
Rejected At-
▼CVE Numbering Authority (CNA)
DoS from MQTT v5.0 Deserialization Fault in core MQTT

Missing bounds validation in the MQTT v5.0 property parser in coreMQTT before 5.0.1 allows an MQTT broker to cause a denial of service by sending a crafted packet. To remediate this issue, users should upgrade to v5.0.1.

Affected Products
Vendor
FreeRTOS
Product
coreMQTT
Default Status
unaffected
Versions
Affected
  • 5.0.0 (custom)
Problem Types
TypeCWE IDDescription
CWECWE-125CWE-125 Out-of-bounds read
Type: CWE
CWE ID: CWE-125
Description: CWE-125 Out-of-bounds read
Metrics
VersionBase scoreBase severityVector
3.17.5HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.08.7HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Version: 3.1
Base score: 7.5
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Version: 4.0
Base score: 8.7
Base severity: HIGH
Vector:
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Metrics Other Info
Impacts
CAPEC IDDescription
CAPEC-540CAPEC-540 Overread Buffers
CAPEC ID: CAPEC-540
Description: CAPEC-540 Overread Buffers
Solutions
Configurations
Workarounds
Exploits
Credits
finder
Epsilon
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/FreeRTOS/coreMQTT/releases/tag/v5.0.1
patch
https://aws.amazon.com/security/security-bulletins/2026-032-aws/
vendor-advisory
https://github.com/FreeRTOS/coreMQTT/security/advisories/GHSA-6qh9-r6jp-2wxc
third-party-advisory
Hyperlink: https://github.com/FreeRTOS/coreMQTT/releases/tag/v5.0.1
Resource:
patch
Hyperlink: https://aws.amazon.com/security/security-bulletins/2026-032-aws/
Resource:
vendor-advisory
Hyperlink: https://github.com/FreeRTOS/coreMQTT/security/advisories/GHSA-6qh9-r6jp-2wxc
Resource:
third-party-advisory
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Details not found