# CVE-2026-73055 — ericcornelissen shescape

> As of 2026-08-15, CVE-2026-73055 is a MEDIUM-severity vulnerability in ericcornelissen shescape, CVSS v3.1 4.8, EPSS 0.2% (11.1th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-73055 as of 2026-08-15; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-08-15

## What is 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.

The record classifies CVE-2026-73055 under weakness class [CWE-116](https://intel.threadlinqs.com/cwe/CWE-116). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 51 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 4.8 — MEDIUM (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N`)
- **CVSS v4.0 base score:** 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`)
- **EPSS (FIRST):** 0.2% probability of exploitation in the next 30 days, higher than 11.1% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 2.8/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-08-15

## Is CVE-2026-73055 being exploited?

It currently carries a trending score of 33 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **ericcornelissen**: shescape

## How to fix CVE-2026-73055

No vendor patch reference has been recorded for CVE-2026-73055 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-73055

No threat campaign in the Threadlinqs corpus currently references CVE-2026-73055, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on 2026-08-16.

**Vendor advisory and patch**

- [github.com — vendor advisory](https://github.com/ericcornelissen/shescape/security/advisories/GHSA-j44h-fqhh-fh28)
- [github.com — patch](https://github.com/ericcornelissen/shescape/commit/d86bf2ae22961c73458bddf70dd06adf9dadb36c)
- [github.com — patch (7cba30594c16a21524706efe2f6c6c9d8923f411)](https://github.com/ericcornelissen/shescape/commit/7cba30594c16a21524706efe2f6c6c9d8923f411)

**Third-party advisory**

- [vulncheck.com — third party advisory](https://www.vulncheck.com/advisories/shescape-before-home-directory-disclosure-via-busybox)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-73055
Full detection coverage and IOCs for threats exploiting CVE-2026-73055 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp