MAL-2026-17303

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/web-vitals-polyfill-core-v1/MAL-2026-17303.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-17303
Published
2026-09-30T00:39:47Z
Modified
2026-09-30T01:00:05Z
Summary
Malicious code in web-vitals-polyfill-core-v1 (npm)
Details

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

Source: amazon-inspector (38311c0f483e9485a7b5e8aa7f9a093a40203d8e1a025c0bf5850c2874cffdfa)

The package name mimics the widely-used web-vitals polyfill but the tarball ships disk/index.min.js, a base64-wrapped service-worker payload (self.PWA_ROUTER.executeTacticalRouting) that resolves an active destination via DoH TXT lookups of api.chinazhangsan.ccwu.cc (queried through doh.pub and dns.alidns.com) with base64-encoded fallback endpoints on gist.githubusercontent.com/chinazhangsan999-crypto and api.npoint.io, performs decoy fetches, and issues Response.redirect(targetUrl, 302) to the resolved host. package.json declares main: index.js which is not present in the tarball, so the package has no legitimate library surface; its shipped code is exclusively the obfuscated redirector, intended to be loaded into a consuming site's service worker where it can hijack end-user navigation to attacker-chosen destinations resolved at runtime through multi-provider DNS-over-HTTPS and paste-site fallbacks.

Database specific 
{
    "malicious-packages-origins":  [
        {
            "id":  "IN-MAL-2026-020749",
            "import_time":  "2026-09-30T00:52:54.455745166Z",
            "modified_time":  "2026-09-30T00:39:47Z",
            "sha256":  "38311c0f483e9485a7b5e8aa7f9a093a40203d8e1a025c0bf5850c2874cffdfa",
            "source":  "amazon-inspector",
            "versions":  [
                "1.0.0"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / web-vitals-polyfill-core-v1

Package

Name
web-vitals-polyfill-core-v1
View open source insights on deps.dev
Purl
pkg:npm/web-vitals-polyfill-core-v1

Affected ranges

Affected versions

1.*
1.0.0

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":  "disk/index.min.js",
            "sha256":  "76ec2b68807c6ef7ae1e93dbc31b21d0ab1fa8ea865719a9b8b85f1bdb295dfe",
            "tlsh":  "e391e796cec72e94d7f8815b35ec7eee0c8e538b3ce3699e525be5d9600940141c58f4"
        }
    ],
    "package_integrity":  [
        {
            "filename":  "web-vitals-polyfill-core-v1-1.0.0.tgz",
            "hashes":  {
                "sha1":  "eed8f8e6cb0ca54e780186b679a466ac774d156d",
                "sha512_sri":  "sha512-+cAO6H59vIT9kOsrXQIoYfR+/KPW3TrSC1AaYkkl+P/hGwsnf8/X6FrzegHqsdxWNPdkwe5nlF/ZPkVt6UBQqQ=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/web-vitals-polyfill-core-v1/MAL-2026-17303.json"