What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 4.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-15 · updated 2026-08-31
• Weakness: CWE-116

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.

Affected products

• ericcornelissen shescape: before 2.1.15; from 3.0.0 before 3.0.2 — fixed in 2.1.15, 3.0.2

How to fix

Upgrade to a fixed version: ericcornelissen shescape 2.1.15, 3.0.2. Check the vendor advisory for mitigations.

References

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

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