Notepad++ up to 8.5.6 detectLanguageFromTextBegining buffer overflow

CVSS Meta Temp Score
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CTI Interest Score
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5.3$0-$5k0.00

Summaryinfo

A vulnerability categorized as critical has been discovered in Notepad++ up to 8.5.6. This affects the function FileManager::detectLanguageFromTextBegining. The manipulation results in buffer overflow. This vulnerability is reported as CVE-2023-40166. The attack requires a local approach. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Notepad++ up to 8.5.6 (Document Reader Software). It has been classified as critical. Affected is the function FileManager::detectLanguageFromTextBegining. The manipulation with an unknown input leads to a buffer overflow vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Notepad++ is a free and open-source source code editor. Versions 8.5.6 and prior are vulnerable to heap buffer read overflow in `FileManager::detectLanguageFromTextBegining `. The exploitability of this issue is not clear. Potentially, it may be used to leak internal memory allocation information. 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. The advisory is shared for download at securitylab.github.com. This vulnerability is traded as CVE-2023-40166 since 08/09/2023. There are known technical details, but no exploit is available.

Upgrading to version 8.5.7 eliminates this vulnerability.

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Productinfo

Type

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA Base Score: 5.5
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: Partially

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

08/09/2023 🔍
08/26/2023 +17 days 🔍
08/26/2023 +0 days 🔍
02/03/2026 +892 days 🔍

Sourcesinfo

Advisory: GHSL-2023-092
Status: Confirmed

CVE: CVE-2023-40166 (🔍)
GCVE (CVE): GCVE-0-2023-40166
GCVE (VulDB): GCVE-100-238092

Entryinfo

Created: 08/26/2023 13:35
Updated: 02/03/2026 16:17
Changes: 08/26/2023 13:35 (51), 02/03/2026 16:14 (2), 02/03/2026 16:17 (19)
Complete: 🔍
Committer: lywand
Cache ID: 216::103

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