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Fencer Vulns
high 8.8

CVE-2026-95509 json

Out-of-bounds read vulnerability in string formatting impacts Qt for MCUs

published 2026-09-29 41 d ago modified 2026-09-30 39 d ago also EUVD-2026-88732

cvss
8.8
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 24%
public exploits
0
none known

Summary

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.

Patch / fix

  • qt Qt for MCUs 2.11.3, 2.12.3

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-95509 updated cvss 8.2

qt: Qt for MCUs: Denial of service via out-of-bounds read in string formatting

  • Red Hat Hardened Images qt6 6.11.2-1.1.hum1, qt5 5.15.18-3.1.hum1, qt6-filesystem 6.11.2-1.1.hum1, qt6-rpm-macros 6.11.2-1.1.hum1, qt5-filesystem 5.15.18-3.1.hum1, qt5-rpm-macros 5.15.18-3.1.hum1, +2 more
    fixed: vendor fix RHSA-2026:80566

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
41 d ago

Exploit prediction

0.31% chance of exploitation in the next 30 days, higher than 24% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 8.8 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N
CNA 4.0 8.8 CVSS: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:X

Affected products

  • qt Qt for MCUs

Classification

Weakness
  • CWE-125 Out-of-bounds Read
  • CWE-131 Incorrect Calculation of Buffer Size

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.