pip self-update functionality can import newly installed modules after wheel installation_CVE-2026-6357

{
    "lastseen": "",
    "description": "pip prior to version 26.1 would run self-update check functionality after installing wheel files which required importing well-known Python modules names. These module imports were intentionally deferred to increase startup time of the pip CLI. The patch changes self-update functionality to run before wheels are installed to prevent newly-installed modules from being imported shortly after the installation of a wheel package. Users should still review package contents prior to installation.",
    "published": "2026-04-27T14:19:47.657Z",
    "modified": "2026-04-27T14:19:47.657Z",
    "type": "cve",
    "title": "pip self-update functionality can import newly installed modules after wheel installation",
    "source": "PSF",
    "references": "https://github.com/pypa/pip/pull/13923\nhttps://ichard26.github.io/blog/2026/04/whats-new-in-pip-26.1/#security-fixes",
    "id": "CVE-2026-6357",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Pip maintainers pip 0",
    "sourceHref": "",
    "cvss": {
        "score": 5.3,
        "severity": "MEDIUM",
        "vector": "CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N",
        "version": "4.0"
    },
    "cvss2": [],
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        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
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            "baseScore": 0,
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    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "pip",
    "version": "0",
    "vendor": "Pip maintainers",
    "ai_description": "",
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}