pnpm: Project env lockfile can short-circuit package-manager resolution and execute lockfile-selected pnpm bytes_CVE-2026-55698

{
    "lastseen": "",
    "description": "pnpm is a package manager. Prior to 10.34.2 and 11.5.3, pnpm can persist package-manager bootstrap metadata in the first YAML document of pnpm-lock.yaml. Before the patch, direct pnpm execution trusted an already resolved packageManagerDependencies entry when the committed env lockfile contained matching pnpm and @pnpm/exe versions. A malicious repository could therefore commit package-manager lockfile package records and snapshots that bypassed fresh package-manager resolution, then cause pnpm to install and execute bytes selected by that committed lockfile state during automatic version switching. This vulnerability is fixed in 10.34.2 and 11.5.3.",
    "published": "2026-06-25T16:43:47.251Z",
    "modified": "2026-06-25T16:43:47.251Z",
    "type": "cve",
    "title": "pnpm: Project env lockfile can short-circuit package-manager resolution and execute lockfile-selected pnpm bytes",
    "source": "GitHub_M",
    "references": "https://github.com/pnpm/pnpm/security/advisories/GHSA-w466-c33r-3gjp",
    "id": "CVE-2026-55698",
    "bulletinFamily": "",
    "cwe": [
        "CWE-345",
        "CWE-494",
        "CWE-829"
    ],
    "cvelist": null,
    "sourceData": "pnpm pnpm < 10.34.2\npnpm pnpm >= 11.0.0, < 11.5.3",
    "sourceHref": "",
    "cvss": {
        "score": 8.8,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "pnpm",
    "version": "< 10.34.2",
    "vendor": "pnpm",
    "ai_description": "A vulnerability in pnpm allows a malicious repository to commit package-manager lockfile package records and snapshots that bypass fresh package-manager resolution, leading to the installation and execution of malicious bytes.",
    "ai_severity": "High",
    "ai_vendor": "pnpm",
    "ai_product": "pnpm",
    "ai_version": "< 10.34.2, >= 11.0.0, < 11.5.3",
    "ai_score": 8.8
}