CVE-2026-94370Network attack vector

Heap corruption via aliased string ownership

Published Oct 14, 2026 · Updated Oct 14, 2026

Heap corruption in Qul::String in Qt for MCUs 2.12.1 through 2.12.2 allows remote attackers to corrupt application memory via text input. Conversion from std::string to the internal string type copies a pointer without transferring ownership, leaving two objects to release the same allocation. Exposure requires an application to pass attacker-controlled text through this interface; documented consequences include double free, invalid free, use-after-free, and application crashes.

CVSS severityUnavailable
Unscored
EPSS probability0.33%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap corruption in Qul::String in Qt for MCUs 2.12.1 through 2.12.2 allows remote attackers to corrupt application memory via text input. Conversion from std::string to the internal string type copies a pointer without transferring ownership, leaving two objects to release the same allocation. Exposure requires an application to pass attacker-controlled text through this interface; documented consequences include double free, invalid free, use-after-free, and application crashes.

The record

CVE
CVE-2026-94370
Published
Oct 14, 2026
Updated
Oct 14, 2026
Vendor
The Qt Company
Product
Qt for MCUs
Classifications
CWE-416, CWE-590, CWE-665, CWE-415, CAPEC-153
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.12.1 <2.12.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Qt Company · Qt for MCUsversion=2.12.1 <2.12.3

Published CVSS scores

6.5Qt CNACVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:H/E:U/S:P/AU:N/R:U/V:D/RE:M

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
CWE-590Free of Memory not on the Heap
CWE-665Improper Initialization
CWE-415Double Free
CAPEC-153Input Data Manipulation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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