mal-2026-4266
Vulnerability from ossf_malicious_packages
Published
2026-05-23 15:56
Modified
2026-05-26 05:55
Summary
Malicious code in discovery-build (npm)
Details
-= Per source details. Do not edit below this line.=-
Source: amazon-inspector (c24a1e59b8c5d3ae1059499825bf47d1abe8d362ddefe264f1a429ed9e7e98cc)
package.json declares scripts.postinstall=node postinstall.js, which executes unconditionally on npm install. The script collects host identifiers (os.hostname(), os.platform(), username, cwd), reads /etc/passwd via fs.readFileSync('/etc/passwd','utf8'), and bulk-enumerates the installer's environment variables (Object.entries(process.env).slice(0, 30)) — capturing whatever CI tokens, AWS credentials, npm tokens, or other secrets happen to be in scope. The collected data is POSTed as JSON over HTTPS to bl0oxto4g54mptbwu8q8i1r0mrsjgg45.oastify.com, a Burp Collaborator out-of-band testing subdomain controlled by whoever generated the payload. The package's self-description as a 'security research canary' does not change installer-side impact: any developer or CI pipeline that installs this package leaks host identity, /etc/passwd, and a slice of environment secrets to an external host without consent.
Source: ossf-package-analysis (122f28edfb2fdddb4059785146e58b64540086c0df37ced45b5bbc9d2dff926a)
The OpenSSF Package Analysis project identified 'discovery-build' @ 1.0.1 (npm) as malicious.
It is considered malicious because:
-
The package communicates with a domain associated with malicious activity.
-
The package executes one or more commands associated with malicious behavior.
CWE
- CWE-506 - The product contains code that appears to be malicious in nature.
- CWE-506 - The product contains code that appears to be malicious in nature.
- CWE-506 - The product contains code that appears to be malicious in nature.
- CWE-506 - The product contains code that appears to be malicious in nature.
{
"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"
},
{
"cweId": "CWE-506",
"description": "The product contains code that appears to be malicious in nature.",
"name": "Embedded Malicious Code"
}
],
"indicators": {
"domains": [
"kf3xr2idaeyvj255ohkhcal9g0msasyh.oastify.com",
"scan.kf3xr2idaeyvj255ohkhcal9g0msasyh.oastify.com"
],
"evidence_files": [
{
"path": "postinstall.js",
"sha256": "120130f07c55a2ca5a55abcfa8bf2ae304aa451cecd9f6d690ca6d23494f344d",
"tlsh": "fd0120f153f0e6b058e30dc0e66588167127e0003305b9e039ac92656b8aeb846f2cec"
}
],
"package_integrity": [
{
"filename": "discovery-build-1.0.1.tgz",
"hashes": {
"sha1": "a1686ed8ee5e85181fd9dc4ad9de2f0f66db6a8e",
"sha512_sri": "sha512-rCxHaZeLVx0J+Tux/KlFxdc1zEuzA/Uj50VS8QICKr5nWWRqE2yfSUodziqJnlAKJ52l6ZL+HiO/jesFwhzgfQ=="
}
}
]
}
},
"package": {
"ecosystem": "npm",
"name": "discovery-build"
},
"versions": [
"1.0.1",
"1.0.3",
"1.0.2",
"1.0.0"
]
}
],
"credits": [
{
"contact": [
"actran@amazon.com"
],
"name": "Amazon Inspector",
"type": "FINDER"
},
{
"contact": [
"https://github.com/ossf/package-analysis",
"https://openssf.slack.com/channels/package_analysis"
],
"name": "OpenSSF: Package Analysis",
"type": "FINDER"
}
],
"database_specific": {
"malicious-packages-origins": [
{
"import_time": "2026-05-23T17:26:10.470314218Z",
"modified_time": "2026-05-23T17:00:59Z",
"sha256": "122f28edfb2fdddb4059785146e58b64540086c0df37ced45b5bbc9d2dff926a",
"source": "ossf-package-analysis",
"versions": [
"1.0.1"
]
},
{
"import_time": "2026-05-23T17:26:10.578145807Z",
"modified_time": "2026-05-23T17:18:07Z",
"sha256": "6f76708e3ff014efa97162fa2278d96f886348d836b3478b81c8025a8831d175",
"source": "ossf-package-analysis",
"versions": [
"1.0.3"
]
},
{
"id": "IN-MAL-2026-004361",
"import_time": "2026-05-26T05:52:26.990294393Z",
"modified_time": "2026-05-23T16:16:39Z",
"sha256": "0a14a42d0af8676cca2cf61f76d68c54cd26d272d999dc034afedc27dd1e572a",
"source": "amazon-inspector",
"versions": [
"1.0.1"
]
},
{
"id": "IN-MAL-2026-004365",
"import_time": "2026-05-26T05:52:27.487855841Z",
"modified_time": "2026-05-23T17:00:37Z",
"sha256": "920fade0555e4d2637f9c27075d0731b8221d99cb64c6544f59bb21c9bcf7a78",
"source": "amazon-inspector",
"versions": [
"1.0.2"
]
},
{
"id": "IN-MAL-2026-004363",
"import_time": "2026-05-26T05:52:27.21022477Z",
"modified_time": "2026-05-23T16:19:53Z",
"sha256": "a96284a15ff7e94835c6bde07e06b9693481ee82776aedf14e2c3a15ee738037",
"source": "amazon-inspector",
"versions": [
"1.0.1"
]
},
{
"id": "IN-MAL-2026-004368",
"import_time": "2026-05-26T05:52:27.79362402Z",
"modified_time": "2026-05-23T17:03:26Z",
"sha256": "b119b3cfa5bbb801aeff6835b8dd7ac5f7f37c6a31f90f09b4804aa121750f20",
"source": "amazon-inspector",
"versions": [
"1.0.3"
]
},
{
"id": "IN-MAL-2026-004351",
"import_time": "2026-05-26T05:52:25.804542925Z",
"modified_time": "2026-05-23T15:56:25Z",
"sha256": "c24a1e59b8c5d3ae1059499825bf47d1abe8d362ddefe264f1a429ed9e7e98cc",
"source": "amazon-inspector",
"versions": [
"1.0.0"
]
},
{
"id": "IN-MAL-2026-004367",
"import_time": "2026-05-26T05:52:27.693683251Z",
"modified_time": "2026-05-23T17:03:26Z",
"sha256": "d21d9aa255e209f19ceedc445ccd53c380a7375780c9df193217ed74099b1956",
"source": "amazon-inspector",
"versions": [
"1.0.3"
]
},
{
"id": "IN-MAL-2026-004366",
"import_time": "2026-05-26T05:52:27.596775946Z",
"modified_time": "2026-05-23T17:00:38Z",
"sha256": "eb50290b5e0d715f1323ec943dd7aa02122bbe9b9172d945de70825f9cf89f75",
"source": "amazon-inspector",
"versions": [
"1.0.2"
]
}
]
},
"details": "\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (c24a1e59b8c5d3ae1059499825bf47d1abe8d362ddefe264f1a429ed9e7e98cc)\npackage.json declares scripts.postinstall=node postinstall.js, which executes unconditionally on `npm install`. The script collects host identifiers (os.hostname(), os.platform(), username, cwd), reads /etc/passwd via fs.readFileSync(\u0027/etc/passwd\u0027,\u0027utf8\u0027), and bulk-enumerates the installer\u0027s environment variables (Object.entries(process.env).slice(0, 30)) \u2014 capturing whatever CI tokens, AWS credentials, npm tokens, or other secrets happen to be in scope. The collected data is POSTed as JSON over HTTPS to bl0oxto4g54mptbwu8q8i1r0mrsjgg45.oastify.com, a Burp Collaborator out-of-band testing subdomain controlled by whoever generated the payload. The package\u0027s self-description as a \u0027security research canary\u0027 does not change installer-side impact: any developer or CI pipeline that installs this package leaks host identity, /etc/passwd, and a slice of environment secrets to an external host without consent.\n\n## Source: ossf-package-analysis (122f28edfb2fdddb4059785146e58b64540086c0df37ced45b5bbc9d2dff926a)\nThe OpenSSF Package Analysis project identified \u0027discovery-build\u0027 @ 1.0.1 (npm) as malicious.\n\nIt is considered malicious because:\n\n- The package communicates with a domain associated with malicious activity.\n\n- The package executes one or more commands associated with malicious behavior.\n",
"id": "MAL-2026-4266",
"modified": "2026-05-26T05:55:02Z",
"published": "2026-05-23T15:56:25Z",
"references": [
{
"type": "PACKAGE",
"url": "https://www.npmjs.com/package/discovery-build/v/1.0.1"
},
{
"type": "PACKAGE",
"url": "https://www.npmjs.com/package/discovery-build/v/1.0.2"
},
{
"type": "PACKAGE",
"url": "https://www.npmjs.com/package/discovery-build/v/1.0.0"
},
{
"type": "PACKAGE",
"url": "https://www.npmjs.com/package/discovery-build/v/1.0.3"
}
],
"schema_version": "1.7.4",
"summary": "Malicious code in discovery-build (npm)"
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
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.
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