MAL-2026-5846

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/prettier_v2/MAL-2026-5846.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-5846
Aliases
  • GHSA-cmfj-34j9-8w66
Published
2026-06-15T23:45:43Z
Modified
2026-07-23T07:52:14.836091831Z
Summary
Malicious code in prettier_v2 (npm)
Details

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

Source: amazon-inspector (52d6c46e6d7e7ba0269dbb3d9725b5943d1b4b94ac2587a5738983cb93d8e1cf)

Package name 'prettier_v2' closely resembles the widely-used 'prettier' formatter package, raising typosquat concerns. The file lib/mirror.js contains a Buffer.from(..., 'base64').toString('utf8') decode pattern, which is commonly used to hide payload strings or code. Without confirmation of how the decoded content is used (data vs. eval/exec), intent cannot be conclusively determined, but the combination of a confusable package name and obfuscated string handling warrants human review before installation.

Source: ghsa-malware (b0da6eb947f9a9046563fe43e0b5064d7dc2a75e019425a564276d44d39bc263)

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": "2026-06-15T23:52:17.798474426Z",
            "source": "ghsa-malware",
            "modified_time": "2026-06-15T23:45:43Z",
            "sha256": "b0da6eb947f9a9046563fe43e0b5064d7dc2a75e019425a564276d44d39bc263",
            "id": "GHSA-cmfj-34j9-8w66",
            "ranges": [
                {
                    "type": "SEMVER",
                    "events": [
                        {
                            "introduced": "0"
                        }
                    ]
                }
            ]
        },
        {
            "import_time": "2026-07-09T22:02:30.983358398Z",
            "source": "amazon-inspector",
            "modified_time": "2026-07-09T21:55:03Z",
            "sha256": "52d6c46e6d7e7ba0269dbb3d9725b5943d1b4b94ac2587a5738983cb93d8e1cf",
            "id": "IN-MAL-2026-009432",
            "versions": [
                "3.8.5"
            ]
        },
        {
            "import_time": "2026-07-20T13:14:50.097517966Z",
            "source": "reversing-labs",
            "modified_time": "2026-07-20T10:54:39Z",
            "sha256": "34e10e35ed57d7d7e1adc4c93dbf2c530d5d78261f9b9a0bfab5f2e831622d33",
            "id": "RLMA-2026-05597",
            "versions": [
                "3.8.5"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / prettier_v2

Package

Name
prettier_v2
View open source insights on deps.dev
Purl
pkg:npm/prettier_v2

Affected ranges

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

Affected versions

3.*
3.8.5

Database specific

source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/prettier_v2/MAL-2026-5846.json"
indicators 
{
    "evidence_files": [
        {
            "sha256": "a0cd29f9351ff2aabb84aeb0389feb65ca4e893d890bec4ed934c425a0bb0f70",
            "tlsh": "8331534d32f221a05577a5dcbb4bec2fb68740027249cac4f64c92d15fd203881a7bdd",
            "path": "lib/mirror.js"
        }
    ]
}
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."
    }
]