WinFSP up to 2.1.25156 Kernel heap-based overflow

CVSS Meta Temp Score
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CTI Interest Score
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7.3$0-$5k0.00

Summaryinfo

A vulnerability was found in WinFSP up to 2.1.25156. It has been declared as critical. This impacts an unknown function of the component Kernel. Executing a manipulation can lead to heap-based overflow. The identification of this vulnerability is CVE-2026-3006. The attack can only be executed locally. There is no exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in WinFSP up to 2.1.25156. It has been declared as critical. This vulnerability affects some unknown processing of the component Kernel. The manipulation with an unknown input leads to a heap-based overflow vulnerability. The CWE definition for the vulnerability is CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Successful exploitation of the race condition vulnerability could allow an attacker to trigger a kernel heap overflow, potentially leading to local privilege escalation and granting system-level access to the affected software.

The weakness was shared by Tay Kiat Loong. The advisory is shared for download at csa.gov.sg. This vulnerability was named CVE-2026-3006 since 02/23/2026. The exploitation appears to be easy. The attack needs to be approached locally. There are neither technical details nor an exploit publicly available.

Upgrading to version 2.2B1 eliminates this vulnerability. The upgrade is hosted for download at github.com.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.4
VulDB Meta Temp Score: 7.3

VulDB Base Score: 7.8
VulDB Temp Score: 7.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.0
CNA Vector (CSA): 🔒

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Heap-based overflow
CWE: CWE-122 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

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: WinFSP 2.2B1

Timelineinfo

02/23/2026 CVE reserved
04/27/2026 +62 days Advisory disclosed
04/27/2026 +0 days VulDB entry created
04/27/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: csa.gov.sg
Researcher: Tay Kiat Loong
Status: Confirmed

CVE: CVE-2026-3006 (🔒)
GCVE (CVE): GCVE-0-2026-3006
GCVE (VulDB): GCVE-100-359764

Entryinfo

Created: 04/27/2026 06:40
Changes: 04/27/2026 06:40 (65)
Complete: 🔍
Cache ID: 216::103

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