CVE-2026-95509

highpriority · track · 0EPSS 0.003 · 24 %ileDE

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.31% (24th) EPSS

CVSS 8.8 · high

Is it mine?

4 products

Check your exposure

Who says so?

1 sources

cert_bund

EPSS · scored 2026-10-27

Strings optimized for Latin-1 displaying Latin-1 characters cause incorrect String.arg() formatting by an incorrect buffer size calculation, causing out-of-bounds reading.

cvss

Technical severity, 0–10. One row per scoring source.

8.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.8–8.8

v4.08.8highCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/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:X/R:X/V:X/RE:X/U:Xsecondary

v4.06.8mediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/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:X/R:X/V:X/RE:X/U:Xsecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-125USCWE-131US

affected products (4)

Products and version ranges known to be affected.

Open Source QT MCUs <2.11.3all versionscert_bundDE
Open Source QT MCUs <2.12.3all versionscert_bundDE
Open Source QT≤ MCUs <2.11.3cert_bundDE
Open Source QT≤ MCUs <2.12.3cert_bundDE

advisories (1)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-3653QT für MCUs: Mehrere Schwachstellen ermöglichen DoS und Manipulation von DatenDeutsch2026-09-29csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in QT ausnutzen, um einen Denial of Service Angriff durchzuführen und Daten zu manipulieren.

sources

Which sources assert this record, and when.

cert_bund NVD CVE.org MITRE

published 2026-09-29modified 2026-09-30

references (1) nvd

External citations — patches, advisories, analysis.

https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products#CVE-2026-95509:

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