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TI-2026-84163 Aliases CVE-2026-103653GHSA-hj4c-cp68-82hw

Out-of-bounds read in Qt CoAP message parsing

Priority LOW 35CWE-125Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
None · Low · High
Fix status
Partial Red Hat: 6 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat.

Summary

Qt CoAP in Qt from 5.13.0 through 6.8.8 and from 6.9.0 through 6.11.2 is affected. Malformed CoAP messages trigger an out-of-bounds read in QCoapInternalReply::createFromFrame() (CWE-125). A remote attacker can send such a message without authentication or user interaction, which crashes the application or makes it continue operating on incorrect data.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

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 it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00291 21st percentileScored 2026-11-07
Fix Partial Red Hat: 6 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
qtQt5.13.0 – 6.8.8; 6.9.0 – 6.11.2—Patch availableCNA
  • Qt Vendorqt Affected 5.13.0 – 6.8.8; 6.9.0 – 6.11.2 Fixed in — Patch available CNA

CPE names CNA · 2

CPEVersionsRoleVendor
cpe:2.3:a:qt:qt:*:*:*:*:*:*:*:*——qt
cpe:2.3:a:qt:qtcoap:*:*:*:*:*:*:*:*——qt
  • cpe:2.3:a:qt:qt:*:*:*:*:*:*:*:* Versions — — ·qt
  • cpe:2.3:a:qt:qtcoap:*:*:*:*:*:*:*:* Versions — — ·qt

Remediation

Upgrade Qt to a fixed release, which the sources record as version 0 for Qt. Red Hat rates the flaw Important and has no fix plan for Red Hat Enterprise Linux 6, 7, 8, 9 and 10 or Red Hat Hardened Images.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix yet
Red Hat Enterprise Linux 6AffectedNo fix yet
Red Hat Enterprise Linux 7AffectedNo fix yet
Red Hat Enterprise Linux 8AffectedNo fix yet
Red Hat Enterprise Linux 9AffectedNo fix yet
Red Hat Hardened ImagesAffectedNo fix yet
Not affected: 1 product
  • Red Hat Hardened Images

Timeline

  1. 2026-11-03 Threatist record created from CVE-2026-103653
  2. 2026-11-03 Alias added: GHSA-hj4c-cp68-82hw
  3. 2026-11-03 CISA SSVC decision points changed
  4. 2026-11-03 Priority changed: MEDIUM → LOW
  5. 2026-11-06 Affected versions changed · Red Hat
  6. 2026-11-06 CVSS score added · Red Hat

References

Patch 2

Advisory 1

  • TI-2024-23902 QAbstractOAuth in Qt Network Authorization in Qt before 5.15.17, 6.x before 6.2.13, 6.3.x… CVSS 3.1CRITICAL 9.8
  • TI-2022-21359 Heap-based buffer overflow in Qt CVSS 3.1HIGH 8.8
  • TI-2022-19524 Integer overflow in Qt CVSS 3.1HIGH 8.8
  • TI-2023-18997 In Qt before 5.15.15, 6.x before 6.2.9, and 6.3.x through 6.5.x before 6.5.2, there can… CVSS 3.1HIGH 7.5
  • TI-2021-09305 Integer Overflow vulnerability in qsvghandler.cpp in Qt qtsvg versions 5.15.1, 6.0.0… CVSS 3.1MEDIUM 5.5
  • TI-2023-28356 An issue was discovered in the HTTP2 implementation in Qt before 5.15.17, 6.x before… CVSS 3.1CRITICAL 9.8
See all 106 →

Sources

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