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).
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| qt | Qt | 5.13.0 – ≤ 6.8.8, 6.9.0 – ≤ 6.11.2 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | qt6 +3 | 6.12.0-1.hum1 | RHSA-2026:89193 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 16.0 | qt6-coap +1 | 6.9.1-bp160.2.1 | openSUSE-SU-2026:22256-1 |
Advisories 3
- RHSA-2026:89193 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- openSUSE-SU-2026:22256-1 Security update for qt6-coap SUSE / openSUSE Security Updates · Nov 11, 2026
- WID-SEC-2026-4290 QT: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Nov 10, 2026