{"id":"CVE-2026-33123","aliases":["GHSA-qpxp-75px-xjcp","PYSEC-2026-3023"],"url":"https://o3.security/vulnerability/CVE-2026-33123","summary":"pypdf has inefficient decoding of array-based streams","details":"pypdf is a free and open-source pure-python PDF library. Versions prior to 6.9.1 allow an attacker to craft a malicious PDF which leads to long runtimes and/or large memory usage. Exploitation requires accessing an array-based stream with many entries. This issue has been fixed in version 6.9.1.","published":"2026-03-20T09:09:12.831Z","modified":"2026-08-05T03:47:26.570406759Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"pypdf","fixedVersion":"6.9.1"}],"fix":{"url":"https://github.com/py-pdf/pypdf/pull/3686","label":"py-pdf/pypdf#3686"},"references":[{"type":"WEB","url":"https://github.com/py-pdf/pypdf/releases/tag/6.9.1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33123.json"},{"type":"ADVISORY","url":"https://github.com/py-pdf/pypdf/security/advisories/GHSA-qpxp-75px-xjcp"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33123"},{"type":"FIX","url":"https://github.com/py-pdf/pypdf/pull/3686"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-05T03:47:26.570406759Z"}}