CVE-2026-34461: Sandboxie-Plus is an open source sandbox-based isolation software for Windows

Q: How do I fix CVE-2026-34461?

sandboxie: upgrade to 1.17.3. Exact commands for each OS are on this page.

Q: Is CVE-2026-34461 being exploited?

CVE-2026-34461 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-34461 affect?

CVE-2026-34461 affects sandboxie. Severity is high (CVSS 7.8). 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 befor

Q: How urgent is CVE-2026-34461?

Priority 34/100. High severity; Public exploit reference

Routine

HIGH 7.8UPGRADE

CVE-2026-34461 is a high-severity flaw (CVSS 7.8) affecting sandboxie. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 len

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 93%)
CISA exploited list	No
Weakness	CWE-121
Published	2026-05-05
Last modified	2026-07-24

Publisher (CNA): GitHub, Inc. · Vendor: sandboxie-plus

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-05 20:16 UTCPublished CVE record published
2026-07-24 22:10 UTCUpdated Record last modified

sandboxie-plus sandboxie UPGRADE

Affected: < 1.17.3

Fixed in: 1.17.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy sandboxie || rpm -q sandboxie || sandboxie --version

2. UPGRADE to 1.17.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade sandboxie

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade sandboxie

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-34461?

sandboxie: upgrade to 1.17.3. Exact commands for each OS are on this page.

Is CVE-2026-34461 being exploited?

CVE-2026-34461 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-34461 affect?

CVE-2026-34461 affects sandboxie. Severity is high (CVSS 7.8). 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 befor

How urgent is CVE-2026-34461?

Priority 34/100. High severity; Public exploit reference

Software pages

Windows vulnerabilities

Related CVEs

CVE-2026-32603 MEDIUM 6.5 UPGRADE Sandboxie is an open source sandbox-based isolation software for Windows
CVE-2026-34458 HIGH 8.8 UPGRADE Sandboxie-Plus is an open source sandbox-based isolation software for Windows
CVE-2026-34464 HIGH 8.8 UPGRADE Sandboxie-Plus is an open source sandbox-based isolation software for Windows
CVE-2026-34459 HIGH 8.8 UPGRADE Sandboxie-Plus is an open source sandbox-based isolation software for Windows
CVE-2026-34462 HIGH 7.8 UPGRADE Sandboxie-Plus is an open source sandbox-based isolation software for Windows

References

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