Dashboard / CVE-2026-8686

CVE-2026-8686

HIGH
MEDIUM Priority: 0.03 BB Relevance: 77/100
Published: 2026-05-15 Modified: 2026-10-25 First seen: 2026-10-29 Status: active

Attack Surface

Network Low Complexity No Auth No Interaction

CVSS Vector Breakdown

AV: Network
AC: Low
PR: None
UI: None
S: X
AT: None
VC: None
VI: None
VA: High

Description

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.

Weakness Classification (1)

Affected Software (1)

VendorProductVersion
freertos coremqtt 5.0.0

References & Advisories (3)

Bug Bounty Relevance

77 / 100
✓ Network accessible
✓ No authentication
✓ Low complexity
✓ No user interaction

CVSS Score

8.7 / 10.0 v4.0
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS — Exploitation Probability

0.39%
Raw Score 0.003880
Percentile 32.8%
Date 2026-10-29

EPSS Trend

2026-10-29
0.00388
2026-10-28
0.00388

Intelligence Sources

nvd ref →

External Links