CVE-2026-73055
9.3
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| ericcornelissen | shescape | 0 < 2.1.15 | affected |
| ericcornelissen | shescape | 2.1.15 | unaffected |
Weaknesses
- CWE-116: Improper Encoding or Escaping of Output
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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