Out-of-bounds write in Qt QTextCodec iconv-based encoding
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- Passive
- Attack complexity
- Low
- Attack requirements
- Present
- Impact type
- —
- Confidentiality · integrity · availability
- None · Low · High
- Fix status
- Partial Red Hat: 6 without a fix
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat.
Summary
Qt from 4.5.0 through 6.8.8 and from 6.9.0 through 6.11.2 is affected. Under certain conditions, the iconv-based encoding in QTextCodec writes outside an internal buffer (CWE-787). This can crash the application and may affect data integrity.
Written with Claude Haiku 5.5 from the sources below · 2026-11-06
Description from the CNA
An out-of-bounds write vulnerability in the Qt QTextCodec iconv-based encoding of the Qt 5 Compatibility APIs module (Qt Core in Qt 5 and earlier) impacts Qt. Under certain conditions, encoding text with QTextCodec may write outside an internal buffer. This can cause the application to crash and may affect data integrity.
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 | 4.5.0 – 6.8.8; 6.9.0 – 6.11.2 | — | Patch available | CNA |
- Qt Vendorqt Affected 4.5.0 – 6.8.8; 6.9.0 – 6.11.2 Fixed in — Patch available CNA
Remediation
The sources list a fix available for Qt but name no fixed version number. Red Hat lists no fix for Red Hat Enterprise Linux 6, 7, 8, 9 and 10 and Red Hat Hardened Images, with no fix planned for Red Hat Enterprise Linux 6 and none available for the others.
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-2026-107590
- 2026-10-27 Alias added: GHSA-6m7p-vvj6-5527
- 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-2026-107590 · CVE Program
- CVE-2026-107590 · NVD
- FIRST EPSS
- GHSA-6m7p-vvj6-5527 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-107590 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences