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TI-2026-63627 Aliases CVE-2026-95509GHSA-5q52-pjpv-x8mh

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

Priority MEDIUM 44CWE-125Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
Low · Low · High
Fix status
Fixed

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

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00312 24th percentileScored 2026-11-07
Fix Fixed Qt for MCUs (qt): 2.11.3, 2.12.3Red Hat: 2 advisories

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
qtQt for MCUs2.6.0 to before 2.11.3; 2.12.0 to before 2.12.32.11.3, 2.12.3Patch availableCNA
  • Qt for MCUs Vendorqt Affected 2.6.0 to before 2.11.3; 2.12.0 to before 2.12.3 Fixed in 2.11.3, 2.12.3 Patch available CNA

Remediation

  • Fix · CNA Qt for MCUs (qt) Fixed in 2.11.3, 2.12.3

Red Hat 2 advisories

  • RHSA-2026:80569 Released 2026-10-12 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images qt6-6.11.2-1.1.hum1@src, qt6-filesystem-6.11.2-1.1.hum1@aarch64, qt6-filesystem-6.11.2-1.1.hum1@s390x +7
  • RHSA-2026:80566 Released 2026-10-12 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images qt5-5.15.18-3.1.hum1@src, qt5-filesystem-5.15.18-3.1.hum1@aarch64, qt5-filesystem-5.15.18-3.1.hum1@s390x +7

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Hardened ImagesFixed RHSA-2026:80566, RHSA-2026:80569

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-95509
  2. 2026-10-03 Alias added: GHSA-5q52-pjpv-x8mh
  3. 2026-10-23 Fix available: RHSA-2026:80569 · Red Hat
  4. 2026-10-23 Fix available: RHSA-2026:80566 · Red Hat
  5. 2026-10-23 Fix available: Red Hat Hardened Images · Red Hat
  6. 2026-10-23 CVSS score added · Red Hat
  7. 2026-10-24 CVSS score changed · Red Hat

References

Other 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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