mal-2026-17763
Vulnerability from ossf_malicious_packages
-= Per source details. Do not edit below this line.=-
Source: amazon-inspector (35a2aead44a4adb850635cf457613400d143b9e4f047767b111058b881cfbb3f)
On npm install, postinstall.js automatically executes and collects a detailed host and environment report — hostname, username, uid/gid, home directory, platform/arch/release, CPU and memory, DNS servers, non-internal network interfaces (name, address, MAC, CIDR), reverse-DNS internal FQDN, container/orchestrator detection, selected npm_* environment variables including scoped registry configuration, CI markers, current working directory, and the parent consuming project's package.json name, version, and declared dependency range. The JSON report is POSTed to https://collector.oob.s4yhii.com/_npm-poc/beacon and a DNS lookup is issued against a subdomain of oob.s4yhii.com as a secondary out-of-band channel. The package is published publicly as @coopeuch/core at version 1.999.999, a version-number shape designed to win resolution against an internal @coopeuch scope — the canonical dependency-confusion attack shape, confirmed by the beacon specifically reporting the consumer's scoped registry env var and internal manifest coordinates. The installer did not consent to disclosing host identity, internal network topology, or the identity of their private project to a third-party host; a self-described proof-of-concept or coordinated-disclosure framing in the package does not change that the code runs unprompted on install and ships installer-identifying data off-host.
- 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"
}
],
"indicators": {
"evidence_files": [
{
"path": "postinstall.js",
"sha256": "cd0d3b55a0161d658c6efcdf4bc172c2a5eccf86e67b380a801662f35fa552fb",
"tlsh": "aae1f86a05fe113222623af4694b50156776d1633504fbf4b9dd8280afcf0ba42bb7ed"
},
{
"path": "package.json",
"sha256": "123cc2876c995a3bb6ef90611c18d20c258f83d0142930dd58d9c4ac0715ce80",
"tlsh": "23e06820c5204f2364c96a591c136049a4a2190743083c2433e710ac0b9c33b88bf32d"
}
],
"package_integrity": [
{
"filename": "core-1.999.999.tgz",
"hashes": {
"sha1": "a694e1871548449c2454cc9817ee53654e06dd04",
"sha512_sri": "sha512-MPSsqrm4iVLssounj3qMhYm+NvTT8qeJ8ZeRNEij1cai2IgKTTRm8zNH14TBeygrtPz90t+sb2FMi/CfdGqghQ=="
}
}
]
}
},
"package": {
"ecosystem": "npm",
"name": "@coopeuch/core"
},
"versions": [
"1.999.999"
]
}
],
"credits": [
{
"contact": [
"inspector-research@amazon.com"
],
"name": "Amazon Inspector",
"type": "FINDER"
}
],
"database_specific": {
"malicious-packages-origins": [
{
"id": "IN-MAL-2026-021446",
"import_time": "2026-10-11T14:18:06.805459793Z",
"modified_time": "2026-10-11T14:01:05Z",
"sha256": "35a2aead44a4adb850635cf457613400d143b9e4f047767b111058b881cfbb3f",
"source": "amazon-inspector",
"versions": [
"1.999.999"
]
}
]
},
"details": "\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (35a2aead44a4adb850635cf457613400d143b9e4f047767b111058b881cfbb3f)\nOn npm install, postinstall.js automatically executes and collects a detailed host and environment report \u2014 hostname, username, uid/gid, home directory, platform/arch/release, CPU and memory, DNS servers, non-internal network interfaces (name, address, MAC, CIDR), reverse-DNS internal FQDN, container/orchestrator detection, selected npm_* environment variables including scoped registry configuration, CI markers, current working directory, and the parent consuming project\u0027s package.json name, version, and declared dependency range. The JSON report is POSTed to https://collector.oob.s4yhii.com/_npm-poc/beacon and a DNS lookup is issued against a subdomain of oob.s4yhii.com as a secondary out-of-band channel. The package is published publicly as @coopeuch/core at version 1.999.999, a version-number shape designed to win resolution against an internal @coopeuch scope \u2014 the canonical dependency-confusion attack shape, confirmed by the beacon specifically reporting the consumer\u0027s scoped registry env var and internal manifest coordinates. The installer did not consent to disclosing host identity, internal network topology, or the identity of their private project to a third-party host; a self-described proof-of-concept or coordinated-disclosure framing in the package does not change that the code runs unprompted on install and ships installer-identifying data off-host.\n",
"id": "MAL-2026-17763",
"modified": "2026-10-11T14:01:05Z",
"published": "2026-10-11T14:01:05Z",
"references": [
{
"type": "PACKAGE",
"url": "https://www.npmjs.com/package/@coopeuch/core/v/1.999.999"
}
],
"schema_version": "1.7.4",
"summary": "Malicious code in @coopeuch/core (npm)"
}
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.
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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.