MAL-2026-5996

See a problem?
Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/@mastra/agent-browser/MAL-2026-5996.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-5996
Aliases
  • GHSA-ph9v-3f5h-hg6p
Published
2026-06-17T05:05:56Z
Modified
2026-07-09T22:17:05.048127196Z
Summary
Malicious code in @mastra/agent-browser (npm)
Details

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

Source: amazon-inspector (49ba6a41e7e43733a8334968ce740af8771208c66c7529d9f4319bd62e39601d)

@mastra/agent-browser@0.3.2 declares a dependency on 'easy-day-js@^1.11.21' in package.json, but the package's own compiled code in dist/index.js never imports or references easy-day-js (only @mastra/core, agent-browser, and zod are used). The dependency name resembles the popular 'dayjs' library and pulling it in at install time means every installer of @mastra/agent-browser also fetches and executes whatever easy-day-js contains. The wrapper package's own code shows no install hooks, no obfuscation, and no exfiltration behavior, so the installer-side risk depends entirely on the contents of easy-day-js. Routing to human review so the transitive can be evaluated and, if malicious, both packages handled together.

Source: ghsa-malware (f47e1be40751417e2e8e62b23068d7f74df247fc0c2b47cdf0b7ddb9733ca2f4)

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": [
        {
            "source": "ghsa-malware",
            "sha256": "f47e1be40751417e2e8e62b23068d7f74df247fc0c2b47cdf0b7ddb9733ca2f4",
            "modified_time": "2026-06-17T05:12:00Z",
            "import_time": "2026-06-17T05:56:08.457583894Z",
            "id": "GHSA-ph9v-3f5h-hg6p",
            "versions": [
                "0.3.2"
            ]
        },
        {
            "source": "amazon-inspector",
            "sha256": "49ba6a41e7e43733a8334968ce740af8771208c66c7529d9f4319bd62e39601d",
            "modified_time": "2026-07-09T21:52:37Z",
            "import_time": "2026-07-09T22:02:29.073505953Z",
            "id": "IN-MAL-2026-009415",
            "versions": [
                "0.3.2"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / @mastra/agent-browser

Package

Name
@mastra/agent-browser
View open source insights on deps.dev
Purl
pkg:npm/%40mastra/agent-browser

Affected ranges

Affected versions

0.*
0.3.2

Database specific

source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/@mastra/agent-browser/MAL-2026-5996.json"
cwes 
[
    {
        "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"
    }
]
indicators 
{
    "evidence_files": [
        {
            "path": "package.json",
            "sha256": "193a4783e899f4ede7928782af15820bfea5d8cdd5a246a6583f7948904cddb9",
            "tlsh": "7d31ed31d5aa8d632bc552a5ac7a1143b53008078dd6bc0833d6120ccf4d2df21fe36d"
        }
    ]
}