pypdf: Possible infinite loop when processing threads/articles in writer_CVE-2026-54651

{
    "lastseen": "",
    "description": "pypdf is a free and open-source pure-python PDF library. Prior to 6.13.1, an attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires merging a file with threads/articles into a writer. This vulnerability is fixed in 6.13.1.",
    "published": "2026-06-22T20:28:28.412Z",
    "modified": "2026-06-22T20:28:28.412Z",
    "type": "cve",
    "title": "pypdf: Possible infinite loop when processing threads/articles in writer",
    "source": "GitHub_M",
    "references": "https://github.com/py-pdf/pypdf/security/advisories/GHSA-g9xf-7f8q-9mcj\nhttps://github.com/py-pdf/pypdf/pull/3839\nhttps://github.com/py-pdf/pypdf/releases/tag/6.13.1",
    "id": "CVE-2026-54651",
    "bulletinFamily": "",
    "cwe": [
        "CWE-835"
    ],
    "cvelist": null,
    "sourceData": "py-pdf pypdf < 6.13.1",
    "sourceHref": "",
    "cvss": {
        "score": 6.9,
        "severity": "MEDIUM",
        "vector": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
        "version": "4.0"
    },
    "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": "pypdf",
    "version": "< 6.13.1",
    "vendor": "py-pdf",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}