Notepad++ vulnerable to heap buffer write overflow in Utf8_16_Read::convert
Priority HIGH 69CWE-120Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-120 and the CVSS impact.
Summary
Notepad++ is a free and open-source source code editor. Versions 8.5.6 and prior are vulnerable to heap buffer write overflow in `Utf8_16_Read::convert`. This issue may lead to arbitrary code execution. As of time of publication, no known patches are available in existing versions of Notepad++.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00517 44th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Total
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 |
|---|---|---|---|---|---|
| notepad-plus-plus | notepad-plus-plus | up to 8.5.6 | — | No fix listed | CNA |
- notepad-plus-plus Vendornotepad-plus-plus Affected up to 8.5.6 Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:notepad-plus-plus:notepad\+\+:*:*:*:*:*:*:*:* | up to 8.5.6 | Vulnerable | notepad-plus-plus |
- cpe:2.3:a:notepad-plus-plus:notepad\+\+:*:*:*:*:*:*:*:* Versions up to 8.5.6 Vulnerable ·notepad-plus-plus
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2023-40031
References
More notepad-plus-plus Notepad++ vulnerabilities
- TI-2025-14195 Notepad++ < 8.8.9 WinGUp Updater Lacks Update Integrity Verification KEVCVSS 4.0HIGH 7.7
- TI-2026-36070 Notepad++: Arbitrary Code Execution via shortcuts.xml UserCommand Injection CVSS 3.1HIGH 7.8
- TI-2026-36048 Notepad++: Arbitrary Code Execution via config.xml commandLineInterpreter CVSS 3.1HIGH 7.8
- TI-2026-04836 Stack-Based Buffer Overflow in Notepad++ File Drop Handler leads to DoS CVSS 3.1HIGH 7.8
- TI-2026-37981 Notepad++ TOCTOU: HMAC Checks Disk, Executes from Memory CVSS 4.0HIGH 7.5
- TI-2022-13732 Buffer overflow in function Notepad_plus::addHotSpot in Notepad++ v8.4.3 and earlier… CVSS 3.1MEDIUM 6.5
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences