MAL-2026-5842

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Import Source

https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/browserslist-db-sync/MAL-2026-5842.json

JSON Data

https://api.osv.dev/v1/vulns/MAL-2026-5842

Aliases

GHSA-mfw9-5hqc-vc53

Published

2026-06-15T23:45:43Z

Modified

2026-07-09T22:17:06.306884581Z

Summary

Malicious code in browserslist-db-sync (npm)

Details

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

Source: amazon-inspector (1aae0de7cc1570688be06b2633a5650b55b99b3abb07029100d6c79d7e3f31da)

lib/mirror.js line 13 contains a Buffer.from(..., "base64").toString("utf8") pattern. This decoding primitive is common in benign code (parsing JWTs, decoding configuration, handling embedded assets) but is also used to obfuscate hardcoded URLs, payloads, or credentials. Contextual tracing of how the decoded value is used did not complete, so intent cannot be determined from the available evidence. The package name suggests a browserslist database mirror/sync utility; a human reviewer should confirm whether the decoded data is benign content (configuration, mirror URL) or hides attacker-controlled strings or executable payload.

Source: ghsa-malware (1e7eebaf0ec5e5d89501d240e0e11dfd758c9a9c6bcaf74a29a2dcabf1a1f502)

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": [
        {
            "sha256": "1e7eebaf0ec5e5d89501d240e0e11dfd758c9a9c6bcaf74a29a2dcabf1a1f502",
            "id": "GHSA-mfw9-5hqc-vc53",
            "import_time": "2026-06-15T23:52:17.802990704Z",
            "modified_time": "2026-06-15T23:45:43Z",
            "ranges": [
                {
                    "events": [
                        {
                            "introduced": "0"
                        }
                    ],
                    "type": "SEMVER"
                }
            ],
            "source": "ghsa-malware"
        },
        {
            "versions": [
                "1.0.6"
            ],
            "id": "IN-MAL-2026-009470",
            "import_time": "2026-07-09T22:02:34.640100996Z",
            "modified_time": "2026-07-09T22:00:17Z",
            "sha256": "2e096565f698b4cc7676f96ab7fd0b9550be7c9927ec826c7dd75449f6e86564",
            "source": "amazon-inspector"
        },
        {
            "versions": [
                "1.0.4"
            ],
            "id": "IN-MAL-2026-009472",
            "modified_time": "2026-07-09T22:00:33Z",
            "import_time": "2026-07-09T22:02:34.801603644Z",
            "sha256": "1aae0de7cc1570688be06b2633a5650b55b99b3abb07029100d6c79d7e3f31da",
            "source": "amazon-inspector"
        }
    ]
}

References

Credits

- Amazon Inspector - FINDER
- - inspector-research@amazon.com

Affected packages

npm / browserslist-db-sync

Package

Name: browserslist-db-sync; View open source insights on deps.dev
Purl: pkg:npm/browserslist-db-sync

Affected ranges

Type: SEMVER
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.0.4

1.0.6

Database specific

indicators

{
    "evidence_files": [
        {
            "sha256": "fac8f6f9664bd7732691fcb9ec47a36613b7e97775acb9064640d1888f5481b1",
            "tlsh": "4831314d32f221a05577a5dcbb4bac2fa58740027249ca84f64c91d15fd203881a7add",
            "path": "lib/mirror.js"
        }
    ]
}

cwes

[
    {
        "name": "Embedded Malicious Code",
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature."
    },
    {
        "cweId": "CWE-506",
        "name": "Embedded Malicious Code",
        "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."
    }
]

source

"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/browserslist-db-sync/MAL-2026-5842.json"