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CVE.org (no NVD analysis yet)· CNA Qt

CVE-2026-103653: Out-of-bounds read vulnerability in CoAP message parsing impacts Qt CoAP

MediumCVSS 6.7 · v4.0—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 26/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.29% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: qt6-coap (openSUSE:Leap 16.0) 6.9.1-bp160.2.1; qt6-coap-docs (openSUSE:Leap 16.0) 6.9.1-bp160.2.1.

Low priority for now. Upgrade to qt6-coap (openSUSE:Leap 16.0) 6.9.1-bp160.2.1; qt6-coap-docs (openSUSE:Leap 16.0) 6.9.1-bp160.2.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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).

Published
Nov 3, 2026
Updated
Nov 3, 2026
EPSS
0.2% · 21th percentile

Report tools

JSON

Action score

26

Monitor

Low priority for now.

CVSS
26 / 40 · 6.7 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Qt
6.7
NVD has not scored this yet; the score shown is the CNA’s.

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-103653

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Qt). Independent of NVD's CPE analysis and usually ahead of it.

  • qt Qt

    • 5.13.0 and later · up to and including 6.8.8affected · python
    • 6.9.0 and later · up to and including 6.11.2affected · python
    • before 5.13.0not affected · python

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
openSUSE:Leap 16.0qt6-coapbefore 6.9.1-bp160.2.16.9.1-bp160.2.1
openSUSE:Leap 16.0qt6-coap-docsbefore 6.9.1-bp160.2.16.9.1-bp160.2.1

Same product

qt: all records

Other highest-scoring records for the same primary product.

  • CVE-2020-12267setMarkdown in Qt before 5.14.2 has a use-after-free related to QTextMarkdownImporter::insertBlock.
    40Plan
  • CVE-2018-19873An issue was discovered in Qt before 5.11.3.
    40Plan
  • CVE-2017-10904Qt for Android prior to 5.9.0 allows remote attackers to execute arbitrary OS commands via unspecified vectors.
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-107457Nov 2, 2026 · Memory corruption vulnerability in QMqttClient impacts Qt MQTT
    9Monitor
  • ← EarlierCVE-2026-100140Nov 2, 2026 · Integer overflow vulnerability in XML parsing functionality of Qt5Compat impacts Qt
    7Monitor
  • Later →CVE-2026-107479Nov 4, 2026 · Integer truncation vulnerability in QTextCodec conversion functions impacts Qt Framework
    6Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
opensuse:qt6-coap6.9.1-bp160.2.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:qt6-coap-docs6.9.1-bp160.2.1 · openSUSE:Leap 16.0Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. Fix recorded+9 d
  3. TodayNov 13, 2026+10 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-1332653 days apartOut-of-bounds read and integer underflow vulnerability in QNdefNfcTextRecord impacts Qt NFC module
    27Monitor
  • CVE-2026-9499105 days apartOut-of-bounds read in QTextCodec::codecForName() in Qt
    25Monitor
  • CVE-2026-1059467 days apartOut-of-bounds read vulnerability in NTLM authentication handling impacts Qt
    21Monitor
  • CVE-2026-7615148 days apartOut-of-bounds read (buffer over-read) vulnerability in HTTP Cache-Control response header parsing impacts Qt Framework (QtNetwork module)
    18Monitor
  • CVE-2026-1074727 days apartOut-of-bounds read vulnerability in QTextCodec TSCII encoding impacts Qt
    17Monitor
  • CVE-2026-10120114 days apartQBinaryJson::fromBinaryData() integer overflow leading to OOB read
    17Monitor

Not on record for this CVE: patch commit or PR link · researcher credit · public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
X

Weakness class (CWE)

CWE-125 · Out-of-bounds Read

CVSS 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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:U/V:X/RE:L/U:Amber

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓
  2. SSVC exploitation— → none
  3. Exploit maturity— → none

For records you follow, these changes also arrive as notifications. →

References

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records