{"id":"CVE-2026-103000","aliases":["GHSA-w23x-9jrw-r45c","PYSEC-2026-4160"],"url":"https://o3.security/vulnerability/CVE-2026-103000","summary":"pypdf: Possible large memory usage when retrieving alphabetical page labels","details":"pypdf is a free and open-source pure-python PDF library. Prior to 6.19.0, a crafted PDF can provide unusually large alphabetical page-label values that cause pypdf/_page_labels.py to generate strings beyond a reasonable page-label length when an application retrieves document page labels, consuming excessive memory and potentially making the application unavailable. This issue is fixed in version 6.19.0.","published":"2026-09-30T20:13:00.379Z","modified":"2026-10-02T03:47:25.973915851Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"PyPI","name":"pypdf","fixedVersion":"6.19.0"}],"fix":{"url":"https://github.com/py-pdf/pypdf/commit/0d8b5a8832cde1ba308b5c27567b879b7b7eed4a","label":"py-pdf/pypdf@0d8b5a8"},"references":[{"type":"WEB","url":"https://github.com/py-pdf/pypdf/releases/tag/6.19.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/103xxx/CVE-2026-103000.json"},{"type":"ADVISORY","url":"https://github.com/py-pdf/pypdf/security/advisories/GHSA-w23x-9jrw-r45c"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-103000"},{"type":"FIX","url":"https://github.com/py-pdf/pypdf/commit/0d8b5a8832cde1ba308b5c27567b879b7b7eed4a"},{"type":"FIX","url":"https://github.com/py-pdf/pypdf/pull/4096"},{"type":"PACKAGE","url":"https://github.com/py-pdf/pypdf"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-02T03:47:25.973915851Z"}}