CVE-2026-34462Public exploit

SYSTEM code execution via unterminated boxname copy

Published May 5, 2026 · Updated May 5, 2026

Stack-based buffer overflow in Sandboxie-Plus Sandboxie 1.17.2 and earlier allows local users to crash SbieSvc or execute code as SYSTEM. ProcessServer handlers pass a non-terminated 34-character boxname from an oversized request to wcscpy, which overflows a 40-character stack buffer. Any local process can reach the NULL-DACL service pipe, and the unsafe copy precedes authorization checks; exploitation can interrupt the service or elevate code execution.

CVSS severity7.8
High
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in Sandboxie-Plus Sandboxie 1.17.2 and earlier allows local users to crash SbieSvc or execute code as SYSTEM. ProcessServer handlers pass a non-terminated 34-character boxname from an oversized request to wcscpy, which overflows a 40-character stack buffer. Any local process can reach the NULL-DACL service pipe, and the unsafe copy precedes authorization checks; exploitation can interrupt the service or elevate code execution.

The record

CVE
CVE-2026-34462
Published
May 5, 2026
Updated
May 5, 2026
Vendor
Sandboxie-Plus
Product
Sandboxie
Classifications
CWE-170, CWE-121, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 5, 2026CVE publishedPublication date reported by the CVE source.
  2. May 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.17.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Sandboxie-Plus · Sandboxieversion=< 1.17.3

Published CVSS scores

7.3GitHub, Inc.CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
7.8NIST National Vulnerability DatabaseCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-170Improper Null Termination
CWE-121Stack-based Buffer Overflow
T1068Exploitation for Privilege Escalation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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