CVE-2026-34461
CVE-2026-34461 is a high-severity vulnerability in Sandboxie-plus Sandboxie with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-121.
Key facts
- Severity: High (CVSS 3.x base score 7.8)
- CVSS v4: 7.3
- EPSS exploit prediction: 0% (7th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-27461
- Weakness: CWE-121
- Affected product: Sandboxie-plus Sandboxie
- Published:
- Last modified:
Description
Sandboxie-Plus is an open source sandbox-based isolation software for Windows. In versions 1.17.2 and earlier, the SbieIniServer RunSbieCtrl handler contains a stack buffer overflow. The MSGID_SBIE_INI_RUN_SBIE_CTRL message is handled before normal sandbox and impersonation checks, and for non-sandboxed callers, the handler copies the trailing message payload into a fixed-size WCHAR ctrlCmd[128] stack buffer using memcpy without verifying the length fits within the buffer. The service pipe is created with a NULL DACL, allowing any local interactive process to connect and send an oversized payload to overflow the stack. This can lead to a crash of the SbieSvc service or potential code execution as SYSTEM. This issue has been fixed in version 1.17.3.
Frequently asked questions
- What is CVE-2026-34461?
- Sandboxie-Plus is an open source sandbox-based isolation software for Windows. In versions 1.17.2 and earlier, the SbieIniServer RunSbieCtrl handler contains a stack buffer overflow. The MSGID_SBIE_INI_RUN_SBIE_CTRL message is handled before normal sandbox and impersonation checks, and for non-sandboxed callers, the handler copies the trailing message payload into a fixed-size WCHAR ctrlCmd[128] stack buffer using memcpy without verifying the length fits within the buffer. The service pipe is created with a NULL DACL, allowing any local interactive process to connect and send an oversized payload to overflow the stack. This can lead to a crash of the SbieSvc service or potential code execution as SYSTEM. This issue has been fixed in version 1.17.3.
- How severe is CVE-2026-34461?
- CVE-2026-34461 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2026-34461 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-34461?
- CVE-2026-34461 affects Sandboxie-plus Sandboxie. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-34461?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- Does CVE-2026-34461 have an EU (EUVD) identifier?
- Yes. CVE-2026-34461 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-27461.
- When was CVE-2026-34461 published?
- CVE-2026-34461 was published on 2026-05-05 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:sandboxie-plus:sandboxie:*:*:*:*:plus:*:*:*
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