Shescape escape() leaves bracket glob expansion active on Bash, BusyBox, and Dash

Exploitation

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

CVSS 4.0

6.9 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X · score source

EPSS

• CVE-2026-32094: 0.23% estimated exploitation activity in the next 30 days; percentile 13.57 (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 Shescape#escape() does not escape square-bracket glob syntax for Bash, BusyBox sh, and Dash. Applications that interpolate the return value directly into a shell command string can cause an attacker-controlled value like secret[12] to expand into multiple filesystem matches instead of a single literal argument, turning one argument into multiple trusted-pathname matches. Details The unquoted Unix escape helpers never add [ or ] to their “special characters” regexes: - src/internal/unix/bash.js:14-30 - src/internal/unix/busybox.js:14-30 - src/internal/unix/dash.js:12-19 They escape /? but not brackets, so new Shescape({ shell: "/usr/bin/bash" }).escape("secret[12]") still produces secret[12]. The fixtures (test/fixtures/unix.js:2236-2265, 3496-3525, 5762-5792) are currently written to expect literal brackets for these shells, confirming the behavior. The documentation recommends Shescape#escape() as the fallback for exec when quoting isn’t possible (docs/recipes.md:154-183).…

Published by the source

11 Mar 2026, 19:53 UTC

Last modified by the source

13 Mar 2026, 11:41 UTC

Source last checked

26 Oct 2026, 12:43 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-9jfh-9xrq-4vwm

2. Revision 2 · amended · 24 Oct 2026

   Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

3. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-9jfh-9xrq-4vwm

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# Patch Next advisory brief: CVE-2026-32094

Advisory: Shescape escape() leaves bracket glob expansion active on Bash, BusyBox, and Dash
IDs: CVE-2026-32094, GHSA-9jfh-9xrq-4vwm
Record: https://patchnext.com/advisories/cve-2026-32094 (revision 3, source checked 26 Oct 2026, 12:43 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.9)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: shescape 2.1.10. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm shescape: affected < 2.1.10; fixed in 2.1.10

## Suggested inspection (read-only)
- `npm ls shescape --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## 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 shescape.
- 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://osv.dev/vulnerability/GHSA-9jfh-9xrq-4vwm (OSV record GHSA-9jfh-9xrq-4vwm lists affected ranges: npm shescape >=0 <2.1.10 (fixed))
- Verified: https://github.com/advisories/GHSA-9jfh-9xrq-4vwm (GitHub-reviewed advisory GHSA-9jfh-9xrq-4vwm lists affected ranges: npm shescape >=0 <2.1.10)

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