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

> Attackers can disclose home directory paths and potentially alter command targets by injecting tilde characters in specific BusyBox shell environments.

- **Severity:** Medium 6.3 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 15 Aug 2026
- **Updated:** 31 Aug 2026
- **Also known as:** GHSA-j44h-fqhh-fh28, GHSA-jfpg-hfv5-2rf7

## What is CVE-2026-73055?

CVE-2026-73055 is a medium-severity vulnerability in ericcornelissen shescape, published on 15 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

Weakness: CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor), CWE-116 (Improper Encoding or Escaping of Output)

## Which versions are affected by CVE-2026-73055?


## How do I fix CVE-2026-73055?

No fix has been published for CVE-2026-73055 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-73055 being exploited?

There is no known exploitation of CVE-2026-73055 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-73055 and fix it if it is affected.

What it is: CVE-2026-73055 is a medium-severity vulnerability in ericcornelissen shescape, published on 15 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-73055 in the wild and no public exploit code.

Affected product: ericcornelissen shescape. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-73055/ (Markdown: https://insights.sbomify.com/CVE-2026-73055/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-73055
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-73055
- OSV: https://osv.dev/vulnerability/CVE-2026-73055

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-73055/
Summaries are generated and may contain mistakes; the official description above is the record.