MAL-2026-17907 (GHSA-PM76-W63J-7J29)
Vulnerability from ossf_malicious_packages – Published: 2026-10-16 18:49 – Updated: 2026-10-19 21:18 – Source website| Ecosystem | Package | Versions |
|---|---|---|
| npm |
@beloved-lenora/opencode-shell-guard
|
Affected: All versions (semver)
1.0.41.0.3
|
The package presents itself as a safety guard that reviews shell commands before execution, but contains an undocumented branch that activates when the user's command contains npm run build. On that trigger it bypasses its own review logic, retrieves an encrypted payload and key via UnsealRpc.unseal({}) from the sibling package @beloved-lenora/opencode-shared-rpc, AES-256-CBC decrypts the ciphertext, writes the plaintext to a randomized hidden path under ~/Library/Application Support/.k7Qm2/vX9pL4.sh, and rewrites the user's command to (npm run build || bash '<staged>') || rm -f '<staged>', executing the staged script as a fallback and self-deleting it afterward. The capability (opaque remote-sourced code execution via a sibling package), the hidden dot-directory staging path, and the post-execution file removal are absent from the plugin's documentation and are concealed behind a cover of local command review. Whoever controls @beloved-lenora/opencode-shared-rpc controls arbitrary shell code that will run on the host of any user of this guard whenever they invoke a npm run build command.
Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.
No description from this source.
| Type | Indicator | Hashes |
|---|---|---|
| Evidence file |
index.ts
|
sha256
284d21f11f49b1ab44da2f08f384ebd2353cefc7a63945e311c767b9194da474tlsh
b481240724f71c31049364a82f8ba849b33022277a45fac8ffed5f255f9e154e1e1399 |
- CWE-506 - Embedded Malicious Code
{
"affected": [
{
"database_specific": {
"cwes": [
{
"cweId": "CWE-506",
"description": "The product contains code that appears to be malicious in nature.",
"name": "Embedded Malicious Code"
},
{
"cweId": "CWE-506",
"description": "The product contains code that appears to be malicious in nature.",
"name": "Embedded Malicious Code"
},
{
"cweId": "CWE-506",
"description": "The product contains code that appears to be malicious in nature.",
"name": "Embedded Malicious Code"
}
],
"indicators": {
"evidence_files": [
{
"path": "index.ts",
"sha256": "284d21f11f49b1ab44da2f08f384ebd2353cefc7a63945e311c767b9194da474",
"tlsh": "b481240724f71c31049364a82f8ba849b33022277a45fac8ffed5f255f9e154e1e1399"
}
]
}
},
"package": {
"ecosystem": "npm",
"name": "@beloved-lenora/opencode-shell-guard"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "SEMVER"
}
],
"versions": [
"1.0.4",
"1.0.3"
]
}
],
"aliases": [
"GHSA-pm76-w63j-7j29"
],
"credits": [
{
"contact": [
"inspector-research@amazon.com"
],
"name": "Amazon Inspector",
"type": "FINDER"
}
],
"database_specific": {
"malicious-packages-origins": [
{
"id": "GHSA-pm76-w63j-7j29",
"import_time": "2026-10-16T19:21:51.052948437Z",
"modified_time": "2026-10-16T18:49:14Z",
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "SEMVER"
}
],
"sha256": "122dea54602061507a3752f709f1e910d9126fdaf9fb282aeab13caca388b3e6",
"source": "ghsa-malware"
},
{
"id": "IN-MAL-2026-021520",
"import_time": "2026-10-18T01:52:23.804965646Z",
"modified_time": "2026-10-18T01:49:59Z",
"sha256": "57da70f7efcc98515e5d5619ad18d558d39c772820ae1c6926b0081af6a0e6dd",
"source": "amazon-inspector",
"versions": [
"1.0.4"
]
},
{
"id": "IN-MAL-2026-021527",
"import_time": "2026-10-19T21:16:38.664008127Z",
"modified_time": "2026-10-19T21:09:55Z",
"sha256": "ff8dd8daa41992a2f1dec185b6924f6cc81b7172b55cccd6930f062317984ba8",
"source": "amazon-inspector",
"versions": [
"1.0.3"
]
}
]
},
"details": "\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (ff8dd8daa41992a2f1dec185b6924f6cc81b7172b55cccd6930f062317984ba8)\nThe package presents itself as a safety guard that reviews shell commands before execution, but contains an undocumented branch that activates when the user\u0027s command contains `npm run build`. On that trigger it bypasses its own review logic, retrieves an encrypted payload and key via `UnsealRpc.unseal({})` from the sibling package `@beloved-lenora/opencode-shared-rpc`, AES-256-CBC decrypts the ciphertext, writes the plaintext to a randomized hidden path under `~/Library/Application Support/.k7Qm2/vX9pL4.sh`, and rewrites the user\u0027s command to `(npm run build || bash \u0027\u003cstaged\u003e\u0027) || rm -f \u0027\u003cstaged\u003e\u0027`, executing the staged script as a fallback and self-deleting it afterward. The capability (opaque remote-sourced code execution via a sibling package), the hidden dot-directory staging path, and the post-execution file removal are absent from the plugin\u0027s documentation and are concealed behind a cover of local command review. Whoever controls `@beloved-lenora/opencode-shared-rpc` controls arbitrary shell code that will run on the host of any user of this guard whenever they invoke a `npm run build` command.\n\n## Source: ghsa-malware (122dea54602061507a3752f709f1e910d9126fdaf9fb282aeab13caca388b3e6)\nAny computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.\n",
"id": "MAL-2026-17907",
"modified": "2026-10-19T21:18:28.974461384Z",
"published": "2026-10-16T18:49:06Z",
"references": [
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-pm76-w63j-7j29"
},
{
"type": "PACKAGE",
"url": "https://www.npmjs.com/package/@beloved-lenora/opencode-shell-guard/v/1.0.4"
},
{
"type": "PACKAGE",
"url": "https://www.npmjs.com/package/@beloved-lenora/opencode-shell-guard/v/1.0.3"
}
],
"schema_version": "1.7.4",
"summary": "Malicious code in @beloved-lenora/opencode-shell-guard (npm)"
}
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