CVE-2026-34464: Sandboxie-Plus is an open source sandbox-based isolation software for Windows

Q: How do I fix CVE-2026-34464?

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

Q: Is CVE-2026-34464 being exploited?

CVE-2026-34464 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-2026-34464 affect?

CVE-2026-34464 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, NamedPipeServer::OpenHandler copies the server field from NAMED_PIPE_OPEN_REQ into a fixed WCHAR pipename[160] stack buffer using

Q: How urgent is CVE-2026-34464?

Priority 38/100. High severity; Public exploit reference

Routine

HIGH 8.8UPGRADE

CVE-2026-34464 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, NamedPipeServer::OpenHandler copies the server field from NAMED_PIPE_OPEN_REQ into a fixed WCHAR pipename[160] stack buffer using wcscat without verifying null termination. The handler only enforces a minimum packet size, and since the service pipe accepts variable-length messages, a sandboxed caller can fill the server[48] field with no

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	0.2% (top 93%)
CISA exploited list	No
Weakness	CWE-121, CWE-170
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-2026-34464?

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

Is CVE-2026-34464 being exploited?

CVE-2026-34464 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-2026-34464 affect?

CVE-2026-34464 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, NamedPipeServer::OpenHandler copies the server field from NAMED_PIPE_OPEN_REQ into a fixed WCHAR pipename[160] stack buffer using

How urgent is CVE-2026-34464?

Priority 38/100. 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-2026-34459 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

← Back to latest CVEs