ericcornelissen shescape up to 2.1.14 os command injection

Summaryinfo

A vulnerability, which was classified as critical, has been found in ericcornelissen shescape up to 2.1.14. This affects the function escape. This manipulation causes os command injection. This vulnerability appears as CVE-2026-73055. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability has been found in ericcornelissen shescape up to 2.1.14 and classified as critical. Affected by this vulnerability is the function escape. The manipulation with an unknown input leads to a os command injection vulnerability. The CWE definition for the vulnerability is CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-73055 since 08/10/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1202 according to MITRE ATT&CK.

Upgrading to version 2.1.15 eliminates this vulnerability.

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Productinfo

Vendor

• ericcornelissen

Name

• shescape

Version

• 2.1.0
• 2.1.1
• 2.1.2
• 2.1.3
• 2.1.4
• 2.1.5
• 2.1.6
• 2.1.7
• 2.1.8
• 2.1.9
• 2.1.10
• 2.1.11
• 2.1.12
• 2.1.13
• 2.1.14

Website

• Product: https://github.com/ericcornelissen/shescape/

CPE 2.3info

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CPE 2.2info

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