CVE-2026-71870

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{"bugzilla": {"description": "pypdf: pypdf: Denial of Service via crafted PDF with large /ToUnicode streams", "id": "2512627", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2512627"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-770", "details": ["A flaw was found in pypdf, a pure-python PDF library. A remote attacker could exploit this vulnerability by providing a specially crafted PDF file. When the library attempts to parse unusually large font /ToUnicode CMap streams during text extraction, it can lead to excessive memory consumption. This can result in a denial of service (DoS) for applications processing such malicious PDF files."], "name": "CVE-2026-71870", "public_date": "2026-08-07T19:28:26Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-71870\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-71870\nhttps://github.com/py-pdf/pypdf/commit/afba8080e19d29a3c256a742b340995e695b35aa\nhttps://github.com/py-pdf/pypdf/pull/3944\nhttps://github.com/py-pdf/pypdf/releases/tag/6.15.0\nhttps://github.com/py-pdf/pypdf/security/advisories/GHSA-fp3f-mc75-235c"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,6.15.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "pypdf", "source": "cna", "vendor": "py-pdf"}, "product": "pypdf", "vendor": "py-pdf"}], "created": "2026-08-07T20:30:17.425691+00:00", "updated": "2026-08-08T01:30:03.150853+00:00", "vendors": ["py-pdf", "py-pdf$PRODUCT$pypdf"]}