MAL-2026-3776

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/typography-stylecss/MAL-2026-3776.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-3776
Published
2026-05-14T19:25:18Z
Modified
2026-05-15T07:51:42.071501Z
Summary
Malicious code in typography-stylecss (npm)
Details

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

Source: amazon-inspector (4eeb50f69746fd21696baaa7d3534bbd22489edb037742ca591d49ca88981f70)

The package impersonates the legitimate @tailwindcss/typography plugin: README, src/index.js, src/utils.js, and src/styles.js are copied verbatim from the Tailwind Labs plugin, and peerDependencies lists tailwindcss to reinforce the masquerade, but the package is published under the unrelated name typography-stylecss. Appended to src/index.js after the legitimate module.exports = plugin.withOptions(...) is an obfuscator.io-style payload (hex-named identifiers _0x168f6b, _0x3fc27f, etc., with a rotated string table _0x5975). Decoded string-table fragments include platform branching ('win32', 'windows', 'agent-linux-') and a URL path template /agents/<deploymentHash> built against a base URL read from a __SSTAR_API_BASE global, consistent with downloading a platform-specific agent binary and executing it. Because this code sits at module top level, it fires on require('typography-stylecss') / import 'typography-stylecss' — exactly the usage the cloned README instructs developers to add to their tailwind.config.js. Any build or dev server that loads the Tailwind config will trigger the dropper, which fetches and runs an attacker-controlled native binary on the installer's machine.

Database specific 
{
    "malicious-packages-origins": [
        {
            "modified_time": "2026-05-14T19:25:18Z",
            "versions": [
                "0.7.4"
            ],
            "sha256": "4eeb50f69746fd21696baaa7d3534bbd22489edb037742ca591d49ca88981f70",
            "id": "IN-MAL-2026-002713",
            "source": "amazon-inspector",
            "import_time": "2026-05-15T07:37:17.770978187Z"
        }
    ]
}
References
Credits

Affected packages

npm / typography-stylecss

Package

Name
typography-stylecss
View open source insights on deps.dev
Purl
pkg:npm/typography-stylecss

Affected ranges

Affected versions

0.*
0.7.4

Database specific

indicators 
{
    "evidence_files": [
        {
            "sha256": "227b58b46968b0f0771baf98a224bfcc400f77ed127d714237f6450f58771062",
            "tlsh": "cc827354b6c6b080138b9b77221fb0e9e12e06cb794c1857f15c78d0bf78619d6eae78",
            "path": "src/index.js"
        },
        {
            "sha256": "a37c94468ea42b0b0a7fb46bd6c689268190093975372c6982e371ac118c56e1",
            "tlsh": "fb31df10dd148eb341d5686a99381517a962c4539a68fc0c33c6478c4f0e2bfa0fe5ee",
            "path": "package.json"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-tiNS5Yl8VmA6Wege03VgUvcFKFce6rvsxUPd9Zp3Y/A9r0PcHTOXiUTKCOvHv7IuMVs4F1kZgK1QfrUxGRSYwA==",
                "sha1": "36f545aa6e3a8aa2f6b12cf22419049fc3fe89c1"
            },
            "filename": "typography-stylecss-0.7.4.tgz"
        }
    ]
}
cwes 
[
    {
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code",
        "cweId": "CWE-506"
    }
]
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/typography-stylecss/MAL-2026-3776.json"