PatchTheCVECVE-2026-103653: An out-of-bounds read vulnerability in the Qt CoAP message parsing (QCoapInternalReply::createFromFrame()) of
CVE-2026-103653 is a medium-severity flaw (CVSS 6.7) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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).
Why this priority
- Remotely exploitable, no login, no user action
No fix is published yet: follow the downgrade or mitigation steps.
Risk facts
| CVSS score | 6.7 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | n/a |
| CISA exploited list | No |
| Weakness | CWE-125 |
| Published | 2026-11-03 |
| Last modified | 2026-11-03 |
Last updated 2026-11-03 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Timeline
- Published CVE record published
- Updated Record last modified
Advisories and coverage
Research and news
- Vulners Bulletins: CVE-2026-103653 Out-of-bounds read vulnerability in CoAP message parsing impacts Qt CoAP 2026-11-03
- Vulners Bulletins: CVE-2026-103653 Out-of-bounds read vulnerability in CoAP message parsing impacts Qt CoAP 2026-11-03
- VulDB Recent Entries: CVE-2026-103653 | Qt up to 5.12.x/6.8.8/6.11.2 CoAP createFromFrame out-of-bounds 2026-11-03
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-103653?
No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.
Is CVE-2026-103653 being exploited?
CVE-2026-103653 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-103653 affect?
CVE-2026-103653 affects affected software. Severity is medium (CVSS 6.7). 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
How urgent is CVE-2026-103653?
Priority 28/100. Remotely exploitable, no login, no user action