Out-of-bounds read in Qt QTextCodec TSCII encoding
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- Passive
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 6 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
Qt from 4.0.0 through 6.8.8 and from 6.9.0 through 6.11.2 contains an out-of-bounds read in the QTextCodec TSCII encoding of the Qt 5 Compatibility APIs module. The conversion can read memory outside the input buffer (CWE-125). A local attacker needs a user to run an application that converts text to TSCII, and the read can crash that application or misinterpret its data.
Written with Claude Haiku 5.5 from the sources below · 2026-11-06
Description from the CNA
An out-of-bounds read vulnerability in the QTextCodec TSCII encoding of the Qt 5 Compatibility APIs module (Qt Core in Qt 5 and earlier) impacts Qt. Applications that convert text to the TSCII encoding through QTextCodec may read memory outside the input buffer, which can cause the application to crash or misinterpret the data.
Why it matters now
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
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| qt | Qt | 4.0.0 – 6.8.8; 6.9.0 – 6.11.2 | — | Patch available | CNA |
- Qt Vendorqt Affected 4.0.0 – 6.8.8; 6.9.0 – 6.11.2 Fixed in — Patch available CNA
Remediation
The sources list no fixed version for Qt. Red Hat lists no fix available for Red Hat Enterprise Linux 7, 8, 9 and 10 and for Red Hat Hardened Images, and no fix planned for Red Hat Enterprise Linux 6.
Written with Claude Haiku 5.5 from the sources below · 2026-11-06
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
| Red Hat Hardened Images | Affected | No fix yet |
Not affected: 1 product
- Red Hat Hardened Images
Timeline
- 2026-10-27 Threatist record created from CVE-2026-107472
- 2026-10-27 Alias added: GHSA-v47w-qwhq-fc6f
- 2026-11-04 CISA SSVC decision points changed
- 2026-11-06 Affected versions changed · Red Hat
- 2026-11-06 CVSS score added · Red Hat
References
More qt vulnerabilities
- 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
Sources
- CVE-2026-107472 · CVE Program
- CVE-2026-107472 · NVD
- FIRST EPSS
- GHSA-v47w-qwhq-fc6f · GitHub Advisory Database · CC BY 4.0
- CVE-2026-107472 · Red Hat security data · CC BY 4.0
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