CVE-2026-34459: Sandboxie-Plus is an open source sandbox-based isolation software for Windows

Q: How do I fix CVE-2026-34459?

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

Q: Is CVE-2026-34459 being exploited?

CVE-2026-34459 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-2026-34459 affect?

CVE-2026-34459 affects sandboxie. Severity is high (CVSS 8.8). 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 escap

Q: How urgent is CVE-2026-34459?

Priority 37/100. High severity; Public exploit reference

Routine

HIGH 8.8UPGRADE

CVE-2026-34459 is a high-severity flaw (CVSS 8.8) 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 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 bypa

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.1% (top 97%)
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-2026-34459?

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

Is CVE-2026-34459 being exploited?

CVE-2026-34459 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-2026-34459 affect?

CVE-2026-34459 affects sandboxie. Severity is high (CVSS 8.8). 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 escap

How urgent is CVE-2026-34459?

Priority 37/100. 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-2026-34461 HIGH 7.8 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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