CVE-2026-8686

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Source
https://cve.org/CVERecord?id=CVE-2026-8686
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-8686.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-8686
Aliases
  • GHSA-6qh9-r6jp-2wxc
Published
2026-05-15T18:38:10Z
Modified
2026-10-21T03:00:34Z
Severity
  • 8.7 (High) CVSS_V4 - 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 CVSS Calculator
Summary
DoS from MQTT v5.0 Deserialization Fault in core MQTT
Details

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.

Database specific 
{
    "cna_assigner":  "AMZN",
    "cwe_ids":  [
        "CWE-125"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/8xxx/CVE-2026-8686.json"
}
References

Affected packages

Git / github.com/freertos/coremqtt

Affected ranges

Type
GIT
Repo
https://github.com/freertos/coremqtt
Events
Introduced
0dd6943057f3fa9a425ea3e1d5e6bd23f5840fd9
Fixed
76e9d89cb8e2fb4cff965329d835594cebebf618
Database specific
Show details 
{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "5.0.0"
                },
                {
                    "last_affected":  "5.0.0"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StandaloneSingleVersion"
        },
        {
            "original_tag":  "v5.0.1",
            "range":  [
                {
                    "fixed":  "76e9d89cb8e2fb4cff965329d835594cebebf618"
                }
            ],
            "source":  "REFERENCES_TAG"
        }
    ]
}

Affected versions

5.*
5.0.0
v5.*
v5.0.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-8686.json"