Notepad++ up to 8.5.6 Utf8_16_Read::convert buffer overflow

CVSS Meta Temp Score
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CTI Interest Score
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6.9$0-$5k0.00

Summaryinfo

A vulnerability marked as critical has been reported in Notepad++ up to 8.5.6. Impacted is the function Utf8_16_Read::convert. The manipulation leads to buffer overflow. This vulnerability is uniquely identified as CVE-2023-40031. The attack is possible to be carried out remotely. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Notepad++ up to 8.5.6 (Document Reader Software). It has been rated as critical. This issue affects the function Utf8_16_Read::convert. The manipulation with an unknown input leads to a buffer overflow vulnerability. Using CWE to declare the problem leads to CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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++.

The weakness was disclosed 08/26/2023 as GHSL-2023-092. It is possible to read the advisory at securitylab.github.com. The identification of this vulnerability is CVE-2023-40031 since 08/08/2023. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 8.5.7 eliminates this vulnerability.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.0
VulDB Meta Temp Score: 6.9

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA Base Score: 7.8
CNA Vector (GitHub, Inc.): 🔍

CVSSv2info

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Buffer overflow
CWE: CWE-120 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Notepad++ 8.5.7

Timelineinfo

08/08/2023 🔍
08/25/2023 +17 days 🔍
08/26/2023 +0 days 🔍
02/03/2026 +892 days 🔍

Sourcesinfo

Advisory: GHSL-2023-092
Status: Confirmed

CVE: CVE-2023-40031 (🔍)
GCVE (CVE): GCVE-0-2023-40031
GCVE (VulDB): GCVE-100-238067

Entryinfo

Created: 08/26/2023 01:27
Updated: 02/03/2026 16:17
Changes: 08/26/2023 01:27 (49), 02/03/2026 16:14 (2), 02/03/2026 16:17 (19)
Complete: 🔍
Committer: lywand
Cache ID: 216::103

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