CVE-2026-31221_CVE-2026-31221

{
    "lastseen": "",
    "description": "PyTorch-Lightning versions 2.6.0 and earlier contain an insecure deserialization vulnerability (CWE-502) in the checkpoint loading mechanism. The LightningModule.load_from_checkpoint() method, which is commonly used to load saved model states, internally calls torch.load() without setting the security-restrictive weights_only=True parameter. This default behavior allows the deserialization of arbitrary Python objects via the Pickle module. A remote attacker can exploit this by providing a maliciously crafted checkpoint file, leading to arbitrary code execution on the victim's system when the file is loaded.",
    "published": "2026-05-12T00:00:00.000Z",
    "modified": "2026-05-15T18:05:39.679Z",
    "type": "cve",
    "title": "CVE-2026-31221",
    "source": "mitre",
    "references": "https://github.com/Lightning-AI/pytorch-lightning\nhttps://www.notion.so/CVE-2026-31221-35d1e1393188815f8db7c4fd08076639",
    "id": "CVE-2026-31221",
    "bulletinFamily": "",
    "cwe": [
        "CWE-502"
    ],
    "cvelist": null,
    "sourceData": "n/a n/a n/a",
    "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": "PyTorch-Lightning",
    "version": "2.6.0 and earlier",
    "vendor": "Lightning AI",
    "ai_description": "Insecure deserialization vulnerability in PyTorch-Lightning's checkpoint loading mechanism, allowing arbitrary code execution",
    "ai_severity": "High",
    "ai_vendor": "Lightning AI",
    "ai_product": "PyTorch-Lightning",
    "ai_version": "2.6.0 and earlier",
    "ai_score": 8.8
}