MAL-2026-13696

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/postcss-initial-provider/MAL-2026-13696.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-13696
Aliases
  • GHSA-44hx-h55m-c65w
Published
2026-08-10T12:23:25Z
Modified
2026-08-11T00:50:17.791068334Z
Summary
Malicious code in postcss-initial-provider (npm)
Details

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

Source: amazon-inspector (e88db5eb44ddcfa3cd22d46e8b6e6a1cd2e7da25a5942d35550d50f2cbbb9ea3)

index.js contains a unicode-escape-obfuscated block that runs when the package is required. It queries public Ethereum RPC endpoints (1rpc.io/eth, eth.drpc.org, ethereum-rpc.publicnode.com, eth-mainnet.public.blastapi.io, eth.blockscout.com/api) for the latest transaction of the hardcoded wallet 0xa322E5f3D311D3080e6f0121063e9aDC2490Ef1a, parses the destination-address bytes of that transaction as two IPv4 addresses, fetches an XOR-encrypted payload from those hosts over HTTP, decrypts it, and executes it both via in-process eval() and via a detached spawn('node', ['-e', <payload>]). Every sensitive string (module names http/https/child_process, HTTP method, paths /0x/cls and /0x/ls, wallet address, RPC hostnames, header x-payload-b64) is hidden via \uXXXX escapes to evade tarball string scans. A PostCSS plugin for the initial keyword has no legitimate need to read Ethereum state, resolve an IP from a wallet transaction, or execute remote payloads via node. This is a supply-chain compromise: any installer that requires this package receives arbitrary attacker-controlled code execution on their host, with the C2 rendezvous point rotatable by the attacker via a new on-chain transaction.

Source: ghsa-malware (aad7afc06fa220be19ff002e973306b7c0945721a33c9561a7e98441949cc905)

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.

Database specific 
{
    "malicious-packages-origins": [
        {
            "import_time": "2026-08-10T12:24:47.063997537Z",
            "sha256": "e88db5eb44ddcfa3cd22d46e8b6e6a1cd2e7da25a5942d35550d50f2cbbb9ea3",
            "modified_time": "2026-08-10T12:23:25Z",
            "source": "amazon-inspector",
            "id": "IN-MAL-2026-017254",
            "versions": [
                "3.0.4"
            ]
        },
        {
            "import_time": "2026-08-11T00:38:01.332342112Z",
            "sha256": "aad7afc06fa220be19ff002e973306b7c0945721a33c9561a7e98441949cc905",
            "modified_time": "2026-08-10T16:41:09Z",
            "source": "ghsa-malware",
            "id": "GHSA-44hx-h55m-c65w",
            "ranges": [
                {
                    "type": "SEMVER",
                    "events": [
                        {
                            "introduced": "0"
                        }
                    ]
                }
            ]
        }
    ]
}
References
Credits

Affected packages

npm / postcss-initial-provider

Package

Name
postcss-initial-provider
View open source insights on deps.dev
Purl
pkg:npm/postcss-initial-provider

Affected ranges

Type
SEMVER
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

3.*
3.0.4

Database specific

source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/postcss-initial-provider/MAL-2026-13696.json"
indicators 
{
    "evidence_files": [
        {
            "sha256": "50598e7727d87398c69c45d67c393c080ab13fc14332dcf613d7a07dc608c047",
            "path": "index.js",
            "tlsh": "932262a453b6acba82326558cc35ae0de1b4dca52d4fd02af82f3c85df761e08751b5c"
        }
    ],
    "package_integrity": [
        {
            "filename": "postcss-initial-provider-3.0.4.tgz",
            "hashes": {
                "sha1": "f44a9ef9fdb7bdce08eaa02e4fbf4cfb0d23b2bd",
                "sha512_sri": "sha512-qbrpxdS8SiF7X/h3tHzE+Qu4FlOf5TEPTztWsJ7K9h0LOaaNKjuMPFvwPr/EvAf7ztYnNwm0q7gK7neNqcrc1A=="
            }
        }
    ]
}
cwes 
[
    {
        "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."
    }
]