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TI-2026-53274 Aliases CVE-2026-76151GHSA-32mm-x94q-6h38

Out-of-bounds read in qt

Priority LOW 22CWE-125Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 1 fixed, 1 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-125 and the CVSS impact.

Summary

Out-of-bounds read (buffer over-read) in the HTTP Cache-Control response header parsing in the QtNetwork module in Qt Group Qt 6.0.0 through 6.8.8, and 6.9.0 through 6.11.1, allows remote attackers to cause a denial of service (application crash) via an excessively large Cache-Control header value returned by an untrusted or compromised HTTP server to an application using QNetworkAccessManager. Only the client side of the connection is affected and 32-bit builds are not affected; the out-of-bounds access is read-only, with no information disclosure and no code execution.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00671 52nd percentileScored 2026-11-07
Fix Partial qt (qt): 6.8.9, 6.11.2Red Hat: 2 advisoriesRed Hat: 1 fixed, 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
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
qtqt6.0.0 to before 6.8.9; 6.9.0 to before 6.11.26.8.9, 6.11.2Patch availableCNA
  • qt Vendorqt Affected 6.0.0 to before 6.8.9; 6.9.0 to before 6.11.2 Fixed in 6.8.9, 6.11.2 Patch available CNA

Remediation

  • Fix · CNA qt (qt) Fixed in 6.8.9, 6.11.2

Red Hat 2 advisories

  • RHSA-2026:82734 Released 2026-10-14 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images qt5-qtbase-5.15.18-5.3.hum1@aarch64, qt5-qtbase-5.15.18-5.3.hum1@s390x, qt5-qtbase-5.15.18-5.3.hum1@src +34
  • RHSA-2026:82382 Released 2026-10-13 · Red Hat rating Important
    Red Hat Hardened Images RPMs Security Update
    • Red Hat Hardened Images qt6-qtbase-6.11.2-3.1.hum1@aarch64, qt6-qtbase-6.11.2-3.1.hum1@s390x, qt6-qtbase-6.11.2-3.1.hum1@src +31

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix yet
Red Hat Hardened ImagesFixed RHSA-2026:82382, RHSA-2026:82734
Not affected: 3 products
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-76151
  2. 2026-10-03 Alias added: GHSA-32mm-x94q-6h38
  3. 2026-10-20 Affected versions changed · Red Hat
  4. 2026-10-20 CVSS score added · Red Hat
  5. 2026-10-21 Fix available: RHSA-2026:82734 · Red Hat
  6. 2026-10-21 Fix available: RHSA-2026:82382 · Red Hat
  7. 2026-10-21 Fix available: Red Hat Hardened Images · Red Hat

References

Patch 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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