CVE-2026-34459
Sandboxie-Plus sandbox escape via uninitialized memory leak and stack overflow in GetRawInputDeviceInfoSlave
Description
Sandboxie-Plus is an open source sandbox-based isolation software for Windows. In versions 1.17.2 and earlier, the SbieSvc proxy service's GetRawInputDeviceInfoSlave handler contains two vulnerabilities that can be chained for sandbox escape. First, when a sandboxed process sends an IPC request with cbSize set to 0, up to 32KB of uninitialized stack memory from the service process is returned, leaking return addresses and stack cookies which bypass ASLR and /GS protections. Second, the handler performs a memcpy with an attacker-controlled length without verifying it fits within the 32KB stack buffer, enabling a stack buffer overflow. By chaining the information leak with the overflow, a sandboxed process can execute a ROP chain to achieve SYSTEM privilege escalation, even from a Security Hardened Sandbox. Hardware-enforced shadow stacks (Intel CET) prevent the ROP chain execution but do not mitigate the information leak. This issue has been fixed in version 1.17.3.
INFO
Published Date :
May 5, 2026, 8:16 p.m.
Last Modified :
July 24, 2026, 10:10 p.m.
Remotely Exploit :
No
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update Sandboxie-Plus to version 1.17.3 or later.
- Apply vendor patches or updates promptly.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-34459.
| URL | Resource |
|---|---|
| https://github.com/sandboxie-plus/Sandboxie/security/advisories/GHSA-7cpc-5hv7-rfmh | Exploit Mitigation Vendor Advisory |
| https://github.com/sandboxie-plus/Sandboxie/security/advisories/GHSA-7cpc-5hv7-rfmh | Exploit Mitigation Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-34459 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-34459
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-34459 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-34459 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Jul. 24, 2026
Action Type Old Value New Value Added Translation Title: Sandboxie de sandboxie-plus, Description: Sandboxie-Plus es un software de aislamiento de código abierto basado en sandbox para Windows. En las versiones 1.17.2 y anteriores, el gestor GetRawInputDeviceInfoSlave del servicio proxy SbieSvc contiene dos vulnerabilidades que pueden encadenarse para un escape de sandbox. Primero, cuando un proceso en sandbox envía una solicitud IPC con cbSize establecido en 0, se devuelven hasta 32KB de memoria de pila no inicializada del proceso de servicio, filtrando direcciones de retorno y cookies de pila que eluden las protecciones ASLR y /GS. Segundo, el gestor realiza un memcpy con una longitud controlada por el atacante sin verificar que encaje dentro del búfer de pila de 32KB, lo que permite un desbordamiento de búfer de pila. Al encadenar la fuga de información con el desbordamiento, un proceso en sandbox puede ejecutar una cadena ROP para lograr una escalada de privilegios SYSTEM, incluso desde un Sandbox Reforzado de Seguridad. Las pilas en sombra impuestas por hardware (Intel CET) evitan la ejecución de la cadena ROP pero no mitigan la fuga de información. Este problema ha sido solucionado en la versión 1.17.3. -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'sandboxie-plus', 'product': 'Sandboxie', 'versions': [{'status': 'affected', 'version': '< 1.17.3'}]}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-34459', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-05-06T00:00:00+00:00'} -
Initial Analysis by [email protected]
May. 07, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H Added CPE Configuration OR *cpe:2.3:a:sandboxie-plus:sandboxie:*:*:*:*:plus:*:*:* versions up to (excluding) 1.17.3 Added Reference Type CISA-ADP: https://github.com/sandboxie-plus/Sandboxie/security/advisories/GHSA-7cpc-5hv7-rfmh Types: Exploit, Mitigation, Vendor Advisory Added Reference Type GitHub, Inc.: https://github.com/sandboxie-plus/Sandboxie/security/advisories/GHSA-7cpc-5hv7-rfmh Types: Exploit, Mitigation, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
May. 06, 2026
Action Type Old Value New Value Added Reference https://github.com/sandboxie-plus/Sandboxie/security/advisories/GHSA-7cpc-5hv7-rfmh -
New CVE Received by [email protected]
May. 05, 2026
Action Type Old Value New Value Added Description Sandboxie-Plus is an open source sandbox-based isolation software for Windows. In versions 1.17.2 and earlier, the SbieSvc proxy service's GetRawInputDeviceInfoSlave handler contains two vulnerabilities that can be chained for sandbox escape. First, when a sandboxed process sends an IPC request with cbSize set to 0, up to 32KB of uninitialized stack memory from the service process is returned, leaking return addresses and stack cookies which bypass ASLR and /GS protections. Second, the handler performs a memcpy with an attacker-controlled length without verifying it fits within the 32KB stack buffer, enabling a stack buffer overflow. By chaining the information leak with the overflow, a sandboxed process can execute a ROP chain to achieve SYSTEM privilege escalation, even from a Security Hardened Sandbox. Hardware-enforced shadow stacks (Intel CET) prevent the ROP chain execution but do not mitigate the information leak. This issue has been fixed in version 1.17.3. Added CVSS V4.0 AV:L/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-121 Added Reference https://github.com/sandboxie-plus/Sandboxie/security/advisories/GHSA-7cpc-5hv7-rfmh