Information disclosure in Ericcornelissen Shescape
CVE-2026-73055
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.004 (26.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 26.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.001
Affected products
- Ericcornelissen Shescape — versions 0, 2.1.15
Weakness classification (CWE)
References
- github.com/ericcornelissen/shescape/security/advisories/GHSA-j44h-fqhh-fh28 (vendor-advisory)
- github.com/ericcornelissen/shescape/commit/d86bf2ae22961c73458bddf70dd06adf9dad… (patch)
- github.com/ericcornelissen/shescape/commit/7cba30594c16a21524706efe2f6c6c9d8923… (patch)
- www.vulncheck.com/advisories/shescape-before-home-directory-disclosure-via-busy… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-73055?
- CVE-2026-73055 is a medium-severity vulnerability in Ericcornelissen Shescape, classified under Improper Encoding or Escaping of Output. CVSS score: 4.8/10. Published 2026-08-15.
- How severe is CVE-2026-73055?
- Medium severity. CVSS v3 base score is 4.8 out of 10.