MAL-2026-12631

See a problem?
Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/claims-patch-url/MAL-2026-12631.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12631
Published
2026-08-05T14:02:33Z
Modified
2026-08-05T14:35:58.322726599Z
Summary
Malicious code in claims-patch-url (npm)
Details

-= Per source details. Do not edit below this line.=-

Source: amazon-inspector (c07292652ca72654d945a2833f8cf8915ea79f1ce665a0445938ff2605394c08)

claims-patch-url@35.3.9 presents an empty ClaimsPatchUrl shell class in index.js and unconditionally requires./compat.js on load. On require(), compat.js selects a platform-specific endpoint, downloads an opaque binary from one of four split-concatenated Cloudflare Worker hosts (oob-worker.cf100-.workers.dev through oob-worker.cf103-.workers.dev) with a DNS-TXT resolveTxt covert-channel fallback under *.dl.wel1.ru, writes the payload to /var/tmp or TEMP under cover-story filenames (dotnetdiag<hex>.exe,.cache<hex>,.analyticsstate), chmods it 0755, and spawns it detached via /bin/sh -c or cmd. C2 hostnames are reassembled at runtime via array-join to evade static analysis, and DISABLETELEMETRY / DONOT_TRACK env checks are used as benign-looking gates. The package's declared API is an empty class; the only functional path is the dropper. Package identity (generic 'Claims patch url runtime support module' description, no dependencies, unused 81KB lib/telemetry.js sibling) is consistent with a typosquat/decoy.

Database specific 
{
    "malicious-packages-origins": [
        {
            "sha256": "c07292652ca72654d945a2833f8cf8915ea79f1ce665a0445938ff2605394c08",
            "id": "IN-MAL-2026-015140",
            "modified_time": "2026-08-05T14:02:33Z",
            "import_time": "2026-08-05T14:20:06.142964232Z",
            "source": "amazon-inspector",
            "versions": [
                "35.3.9"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / claims-patch-url

Package

Name
claims-patch-url
View open source insights on deps.dev
Purl
pkg:npm/claims-patch-url

Affected ranges

Affected versions

35.*
35.3.9

Database specific

indicators 
{
    "evidence_files": [
        {
            "sha256": "5999dd0bae285044b2dda796844c43d2e14565802ce91e0d53ba74d82d187a62",
            "path": "_compat.js",
            "tlsh": "5aa1869a15aa70188770dbe487275416f55bf6633380c284f79ca9984fb71288371efc"
        },
        {
            "sha256": "9cf34353320aa79af63dc0ee93d67bd54d94240a0337ff5b3a723c9488221a45",
            "path": "index.js",
            "tlsh": "82f0509925deb463c6b0f3f7de720052f55388214b5b019479c950ef0fb0914029debe"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-l8HFs3VSbqfUuaHCZq0YBVFkmBWsHN9U7M3Y/RuXzD+0xIgGBFrVE+HmUN+luWgvD3zSCJWbRaZyiWPJNuPkyg==",
                "sha1": "db4c92b610e9b8c44816d63ca0f68751b3035d6c"
            },
            "filename": "claims-patch-url-35.3.9.tgz"
        }
    ]
}
cwes 
[
    {
        "name": "Embedded Malicious Code",
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506"
    }
]
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/claims-patch-url/MAL-2026-12631.json"