{"id":"CVE-2026-84311","aliases":["GHSA-763m-79hh-57f2"],"url":"https://o3.security/vulnerability/CVE-2026-84311","summary":"pypdf: Possible long runtimes/large memory usage when extracting XForm objects","details":"pypdf is a free and open-source pure-python PDF library. Prior to 6.16.1, an attacker can craft a PDF that causes pypdf/_page.py PageObject._extract_text and PageObject.extract_xform_text to traverse a directed acyclic graph of reused form XObjects in which each form invokes a child multiple times, creating exponentially many traversal paths and causing long runtimes and large memory consumption. This issue is fixed in version 6.16.1.","published":"2026-09-01T20:03:13.421Z","modified":"2026-09-04T03:30:44.465097010Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"PyPI","name":"pypdf","fixedVersion":"6.16.1"}],"fix":{"url":"https://github.com/py-pdf/pypdf/commit/d91ab705fd81ed1a9cec175c6958600dea1a4942","label":"py-pdf/pypdf@d91ab70"},"references":[{"type":"WEB","url":"https://github.com/py-pdf/pypdf/releases/tag/6.16.1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/84xxx/CVE-2026-84311.json"},{"type":"ADVISORY","url":"https://github.com/py-pdf/pypdf/security/advisories/GHSA-763m-79hh-57f2"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-84311"},{"type":"FIX","url":"https://github.com/py-pdf/pypdf/commit/d91ab705fd81ed1a9cec175c6958600dea1a4942"},{"type":"FIX","url":"https://github.com/py-pdf/pypdf/pull/3966"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-04T03:30:44.465097010Z"}}