MAL-2026-5539

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Import Source

https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/mermaid-v11/MAL-2026-5539.json

JSON Data

https://api.osv.dev/v1/vulns/MAL-2026-5539

Aliases

GHSA-xmj9-vhj4-8q6c

Published

2026-06-11T00:41:50Z

Modified

2026-06-16T00:01:49.657832429Z

Summary

Malicious code in mermaid-v11 (npm)

Details

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

Source: amazon-inspector (416d5c5ab1bc70076021520f20e67c3c52a81b74832379e19012fa2f6526c469)

The package impersonates the legitimate mermaid diagramming library (name mermaid-v11, bogus version 9999.0.2, description 'Mermaid v11 diagramming library') and ships no library code — only a malicious preinstall lifecycle hook. On npm install, package.json line 6 runs node -e that reads require('os').hostname() and the OS username and beacons them out-of-band to an attacker-controlled Interactsh endpoint via two channels: an HTTPS GET to https://d8l0dj5t5p5il86s3d3gepriqucsnn1nd.oast.me/?h=<hostname>&u=<username>&pkg=mermaid-v11, and a DNS lookup of mermaid-v11.<hostname>.d8l0dj5t5p5il86s3d3gepriqucsnn1nd.oast.me to leak the hostname through the resolver chain. The behavior fires automatically on default install with no user interaction, harvesting installer host identifiers for an attacker-controlled OAST listener.

Source: ghsa-malware (08e5fdefe3805b0f3e8caac9d44a8b8f95355b589742610913ba8ae5c357a498)

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.

Source: ossf-package-analysis (003edde2881c4b52d0a0ae821b81083c569fc8bf9ef236a216c82054e2cb3b4f)

The OpenSSF Package Analysis project identified 'mermaid-v11' @ 9999.0.2 (npm) as malicious.

It is considered malicious because:

The package communicates with a domain associated with malicious activity.

Database specific

{
    "malicious-packages-origins": [
        {
            "import_time": "2026-06-11T01:21:48.587989408Z",
            "source": "ossf-package-analysis",
            "modified_time": "2026-06-11T00:56:11Z",
            "sha256": "003edde2881c4b52d0a0ae821b81083c569fc8bf9ef236a216c82054e2cb3b4f",
            "versions": [
                "9999.0.2"
            ]
        },
        {
            "import_time": "2026-06-11T01:21:48.528302812Z",
            "source": "ossf-package-analysis",
            "modified_time": "2026-06-11T00:41:50Z",
            "sha256": "e09f1e6e06b756c14d4bf0c26e54a82093ee00a8b8190974088973cb664aada7",
            "versions": [
                "9999.0.0"
            ]
        },
        {
            "import_time": "2026-06-11T02:24:27.684217154Z",
            "source": "amazon-inspector",
            "modified_time": "2026-06-11T01:46:53Z",
            "sha256": "334e4086eca8d2c76ec7ba03c6e47af121ed5ef043b0e4bf30db86248d064467",
            "id": "IN-MAL-2026-005359",
            "versions": [
                "9999.0.2"
            ]
        },
        {
            "import_time": "2026-06-11T02:24:27.62799726Z",
            "source": "amazon-inspector",
            "modified_time": "2026-06-11T01:46:52Z",
            "sha256": "416d5c5ab1bc70076021520f20e67c3c52a81b74832379e19012fa2f6526c469",
            "id": "IN-MAL-2026-005358",
            "versions": [
                "9999.0.2"
            ]
        },
        {
            "import_time": "2026-06-11T02:24:27.762128916Z",
            "source": "amazon-inspector",
            "modified_time": "2026-06-11T01:46:58Z",
            "sha256": "5ef3e485f7b13c78c745d0e7165199eacb142cb62da22b44eaa51460474f10b9",
            "id": "IN-MAL-2026-005360",
            "versions": [
                "9999.0.1"
            ]
        },
        {
            "import_time": "2026-06-11T02:24:27.969639096Z",
            "source": "amazon-inspector",
            "modified_time": "2026-06-11T01:48:16Z",
            "sha256": "c3188d09fdd69443609241a8e3baac0c120837170b801b7eaa7ad2c0f5b5808a",
            "id": "IN-MAL-2026-005364",
            "versions": [
                "9999.0.0"
            ]
        },
        {
            "import_time": "2026-06-11T02:24:27.80392393Z",
            "source": "amazon-inspector",
            "modified_time": "2026-06-11T01:46:58Z",
            "sha256": "e00db32b40228301a09dc2a6245bca93536d909e4e8e5b8c1d207586337947df",
            "id": "IN-MAL-2026-005361",
            "versions": [
                "9999.0.1"
            ]
        },
        {
            "import_time": "2026-06-11T02:24:28.026904512Z",
            "source": "amazon-inspector",
            "modified_time": "2026-06-11T01:48:16Z",
            "sha256": "ed2c7d1b0095d1d538c4302304b30a940efd8cb6c0de4ae28e09f76ef7de6a25",
            "id": "IN-MAL-2026-005365",
            "versions": [
                "9999.0.0"
            ]
        },
        {
            "import_time": "2026-06-15T23:52:17.808442455Z",
            "source": "ghsa-malware",
            "modified_time": "2026-06-15T23:38:33Z",
            "sha256": "08e5fdefe3805b0f3e8caac9d44a8b8f95355b589742610913ba8ae5c357a498",
            "id": "GHSA-xmj9-vhj4-8q6c",
            "ranges": [
                {
                    "type": "SEMVER",
                    "events": [
                        {
                            "introduced": "0"
                        }
                    ]
                }
            ]
        }
    ]
}

References

Credits

- Amazon Inspector - FINDER
- - inspector-research@amazon.com
- OpenSSF: Package Analysis - FINDER
- - https://github.com/ossf/package-analysis
  - https://openssf.slack.com/channels/package_analysis

Affected packages

npm / mermaid-v11

Package

Name: mermaid-v11; View open source insights on deps.dev
Purl: pkg:npm/mermaid-v11

Affected ranges

Type: SEMVER
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

9999.*

9999.0.0

9999.0.1

9999.0.2

Database specific

source

"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/mermaid-v11/MAL-2026-5539.json"

indicators

{
    "evidence_files": [
        {
            "sha256": "e4d3d429ed4dda6b54024546edbbc51916777528ad52c4b8504b74884c5bc82f",
            "path": "package.json",
            "tlsh": "b4f0d4fd0b10f6230ed90271429e720da5d2ea03754c9811c9e703ca47697f3bd75036"
        }
    ],
    "domains": [
        "d8l0dj5t5p5il86s3d3gepriqucsnn1nd.oast.me",
        "mermaid-v11.scan-2579d3f17b08.d8l0dj5t5p5il86s3d3gepriqucsnn1nd.oast.me"
    ],
    "package_integrity": [
        {
            "filename": "mermaid-v11-9999.0.2.tgz",
            "hashes": {
                "sha512_sri": "sha512-hxuwqfGRTWtEAl0buMUz4BmUZaIisJTmMu/SAS2gzV+oALV5LGfWD2escRKjfWaGkPQA3tNePgUWMq4IUwFddg==",
                "sha1": "48b784b0037181a17d7ed2fe08f214a2006220eb"
            }
        }
    ]
}

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."
    },
    {
        "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."
    }
]