An out-of-bounds read vulnerability in the Qt CoAP message parsing (QCoapInternalReply::createFromFrame()) of the Qt CoAP module. Processing a malformed CoAP message can cause an application using Qt CoAP to crash (loss of availability) or to continue operating on incorrect data (potential loss of integrity).

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
qt Qt unaffected
Version Status Constraints
5.13.0 affected ≤ 6.8.8
6.9.0 affected ≤ 6.11.2
0 unaffected < 5.13.0

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Project Subscriptions

Vendors Products
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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://codereview.qt-project.org/c/qt/qtcoap/+/760652 cve-icon cve-icon
https://codereview.qt-project.org/c/qt/qtcoap/+/761120 cve-icon cve-icon
https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products#CVE-2026-103653: cve-icon cve-icon
History

Tue, 03 Nov 2026 07:45:00 +0000

Type Values Removed Values Added
Description An out-of-bounds read vulnerability in the Qt CoAP message parsing (QCoapInternalReply::createFromFrame()) of the Qt CoAP module. Processing a malformed CoAP message can cause an application using Qt CoAP to crash (loss of availability) or to continue operating on incorrect data (potential loss of integrity).
Title Out-of-bounds read vulnerability in CoAP message parsing impacts Qt CoAP
First Time appeared Qt
Qt qt
Qt qtcoap
Weaknesses CWE-125
CPEs cpe:2.3:a:qt:qt:*:*:*:*:*:*:*:*
cpe:2.3:a:qt:qtcoap:*:*:*:*:*:*:*:*
Vendors & Products Qt
Qt qt
Qt qtcoap
References
Metrics cvssV4_0

{'score': 6.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:U/AU:Y/R:U/RE:L/U:Amber'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Qt

Published:

Updated: 2026-11-03T07:35:45.306Z

Reserved: 2026-10-01T07:37:03.945Z

Link: CVE-2026-103653

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-11-03T08:17:13.830

Modified: 2026-11-03T08:17:13.830

Link: CVE-2026-103653

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-11-03T08:30:17Z

Weaknesses