Vulnerability-Lookup

CVE-2026-73411 (GCVE-0-2026-73411)

Vulnerability from cvelistv5 – Published: 2026-08-12 19:33 – Updated: 2026-08-12 20:54

Title

Shescape: Home-directory disclosure in assignment context on Unix with Dash

Summary

Shescape is a simple shell escape library for JavaScript. Prior to 2.1.14 and 3.0.1, getEscapeFunction in src/internal/unix/dash.js fails to escape ~ after : or = when applications use the escape or escapeAll APIs on Unix with shell set to dash, or with shell set to true when Dash is the default, and interpolate the result into an assignment prefixed to a command. An attacker who controls the input can supply a value such as :~ to disclose the home-directory path and may change the location on which the command operates. This issue is fixed in versions 2.1.14 and 3.0.1.

Severity

6.3 (Medium)


                        
                          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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-12 20:36 UTC

CWE

CWE-116 - Improper Encoding or Escaping of Output
CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor

Assigner

GitHub_M

References

7 references

URL	Tags
https://github.com/ericcornelissen/shescape/secur…	x_refsource_CONFIRM
https://github.com/ericcornelissen/shescape/pull/2649	x_refsource_MISC
https://github.com/ericcornelissen/shescape/pull/2651	x_refsource_MISC
https://github.com/ericcornelissen/shescape/commi…	x_refsource_MISC
https://github.com/ericcornelissen/shescape/commi…	x_refsource_MISC
https://github.com/ericcornelissen/shescape/relea…	x_refsource_MISC
https://github.com/ericcornelissen/shescape/relea…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
ericcornelissen	shescape	Affected: < 2.1.14 Affected: >= 3.0.0, < 3.0.1

Show details on NVD website

JSON

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GHSA-Q53C-4PRM-W95Q

Vulnerability from github – Published: 2026-07-24 22:34 – Updated: 2026-08-12 19:33

Summary

Shescape: Home-directory disclosure in assignment context on Unix with Dash

Details

Impact

This impacts users of Shescape on Unix systems that explicitly configure shell to Dash, or true when the default shell is Dash, using the escape and escapeAll APIs in assignments prefixed to a command.

An attacker may be able to obtain the location of the home directory and, depending on how it is used, change the location on which a command operates in unexpected ways.

import * as cp from "node:child_process";
import { Shescape } from "shescape";

// 1. Prerequisites
const options = {
    shell: "dash",
    // Or
    shell: true, // Only if the default shell is Dash
};

// 2. Payload
const payload = ":~";

// 3. Usage
const shescape = new Shescape(options);
let escapedPayload;

escapedPayload = shescape.escape(payload);
// Or
escapedPayload = shescape.escapeAll([payload]);

// And (example)
const result = cp.execSync(`V=${escapedPayload}; echo $V`, options);

// 4. Impact
console.log(result.toString());
// Outputs ":" followed by the user's home directory

Patches

This bug has been patched in [v2.1.14] and [v3.0.1] which you can upgrade to now.

If you are already using v3 of Shescape, no further changes are required. If you are using v2 of Shescape it is recommended to upgrade as this version reaches end-of-life status on 2026-09-28, follow the [migration guide] to upgrade to v3.

No patches will be released for version of Shescape lower than v2.0.0.

Workarounds

Alternatively, users of Shescape can 1) refrain from using Dash, 2) use the env option of the node:child_process API to inject variables with untrusted values instead, or 3) remove all instances of ~ from untrusted inputs.

For more information

Comment on Pull Request [#2651] for v2 and [#2649] for v3
Comment on commit [b4b34c3] for v2 and [43d70b5] for v3
Open an issue at https://github.com/ericcornelissen/shescape/issues (New issue > Question)

Severity

6.3 (Medium)


                  
                    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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "shescape"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.1.14"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "shescape"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.0.0"
            },
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            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-73411"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-116",
      "CWE-200"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-24T22:34:39Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "### Impact\n\nThis impacts users of Shescape on Unix systems that explicitly configure `shell` to Dash, or `true` when the default shell is Dash, using the `escape` and `escapeAll` APIs in assignments prefixed to a command.\n\nAn attacker may be able to obtain the location of the home directory and, depending on how it is used, change the location on which a command operates in unexpected ways.\n\n```javascript\nimport * as cp from \"node:child_process\";\nimport { Shescape } from \"shescape\";\n\n// 1. Prerequisites\nconst options = {\n    shell: \"dash\",\n    // Or\n    shell: true, // Only if the default shell is Dash\n};\n\n// 2. Payload\nconst payload = \":~\";\n\n// 3. Usage\nconst shescape = new Shescape(options);\nlet escapedPayload;\n\nescapedPayload = shescape.escape(payload);\n// Or\nescapedPayload = shescape.escapeAll([payload]);\n\n// And (example)\nconst result = cp.execSync(`V=${escapedPayload}; echo $V`, options);\n\n// 4. Impact\nconsole.log(result.toString());\n// Outputs \":\" followed by the user\u0027s home directory\n```\n\n### Patches\n\nThis bug has been patched in [v2.1.14] and [v3.0.1] which you can upgrade to now.\n\nIf you are already using v3 of Shescape, no further changes are required. If you are using v2 of Shescape it is recommended to upgrade as this version reaches end-of-life status on 2026-09-28, follow the [migration guide] to upgrade to v3.\n\nNo patches will be released for version of Shescape lower than v2.0.0.\n\n### Workarounds\n\nAlternatively, users of Shescape can 1) refrain from using Dash, 2) use the `env` option of the `node:child_process` API to inject variables with untrusted values instead, or 3) remove all instances of `~` from untrusted inputs.\n\n### For more information\n\n- Comment on Pull Request [#2651] for v2 and [#2649] for v3\n- Comment on commit [b4b34c3] for v2 and [43d70b5] for v3\n- Open an issue at \u003chttps://github.com/ericcornelissen/shescape/issues\u003e (New issue \u003e Question)",
  "id": "GHSA-q53c-4prm-w95q",
  "modified": "2026-08-12T19:33:11Z",
  "published": "2026-07-24T22:34:39Z",
  "references": [
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      "type": "WEB",
      "url": "https://github.com/ericcornelissen/shescape/security/advisories/GHSA-q53c-4prm-w95q"
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    {
      "type": "PACKAGE",
      "url": "https://github.com/ericcornelissen/shescape"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ericcornelissen/shescape/blob/dea8893a5877893d8d4923dbf253080e08899e6d/docs/migration.md"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ericcornelissen/shescape/releases/tag/v2.1.14"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ericcornelissen/shescape/releases/tag/v3.0.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Shescape: Home-directory disclosure in assignment context on Unix with Dash"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

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