PinchTab: OS Command Injection via Profile Name in Windows Cleanup Routine Enables Arbitrary Command Execution

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

6.7 · CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:L

EPSS

• CVE-2026-33623: 3.02% estimated exploitation activity in the next 30 days; percentile 87.45 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary PinchTab v0.8.4 contains a Windows-only command injection issue in the orphaned Chrome cleanup path. When an instance is stopped, the Windows cleanup routine builds a PowerShell -Command string using a needle derived from the profile path. In v0.8.4, that string interpolation escapes backslashes but does not safely neutralize other PowerShell metacharacters. If an attacker can launch an instance using a crafted profile name and then trigger the cleanup path, they may be able to execute arbitrary PowerShell commands on the Windows host in the security context of the PinchTab process user. This is not an unauthenticated internet RCE. It requires authenticated, administrative-equivalent API access to instance lifecycle endpoints, and the resulting command execution inherits the permissions of the PinchTab OS user rather than bypassing host privilege boundaries. Details Issue 1 — PowerShell command string built with interpolated user-influenced data…

Published by the source

24 Mar 2026, 19:46 UTC

Last modified by the source

27 Mar 2026, 21:19 UTC

Source last checked

26 Oct 2026, 15:18 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-p8mm-644p-phmh

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# Patch Next advisory brief: CVE-2026-33623

Advisory: PinchTab: OS Command Injection via Profile Name in Windows Cleanup Routine Enables Arbitrary Command Execution
IDs: CVE-2026-33623, GHSA-p8mm-644p-phmh
Record: https://patchnext.com/advisories/cve-2026-33623 (revision 1, source checked 26 Oct 2026, 15:18 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.7)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/pinchtab/pinchtab 0.8.5; github.com/pinchtab/pinchtab/cmd/pinchtab 0.8.5. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/pinchtab/pinchtab: affected < 0.8.5; fixed in 0.8.5
- Go github.com/pinchtab/pinchtab/cmd/pinchtab: affected <= 0.8.4; fixed in 0.8.5

## Suggested inspection (read-only)
- Go github.com/pinchtab/pinchtab: check the installed version with your package manager.
- Go github.com/pinchtab/pinchtab/cmd/pinchtab: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/pinchtab/pinchtab, github.com/pinchtab/pinchtab/cmd/pinchtab.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-p8mm-644p-phmh (GitHub-reviewed advisory GHSA-p8mm-644p-phmh lists affected ranges: Go github.com/pinchtab/pinchtab/cmd/pinchtab >=0 =0 <0.8.5)

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