{"cve":"CVE-2026-33123","nvd":{"published":"2026-03-20T10:16:18.717","modified":"2026-06-17T10:36:59.213","status":"Analyzed","description":"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.","cvss_v4":{"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","score":5.1},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","score":6.5},"cwes":["CWE-400","CWE-407"],"references":["https://github.com/py-pdf/pypdf/pull/3686","https://github.com/py-pdf/pypdf/releases/tag/6.9.1","https://github.com/py-pdf/pypdf/security/advisories/GHSA-qpxp-75px-xjcp"],"products":["pypdf_project:pypdf"],"source":"nvd","synced_at":"2026-10-19T22:26:19.218427112+00:00"},"epss":{"cve":"CVE-2026-33123","score":0.00355,"percentile":0.29277,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-qpxp-75px-xjcp","url":"https://osv.dev/vulnerability/GHSA-qpxp-75px-xjcp","summary":"pypdf has inefficient decoding of array-based streams","modified":"2026-09-10T03:51:00.643708515Z","packages":[{"ecosystem":"PyPI","name":"pypdf","purl":"pkg:pypi/pypdf","ranges":["<6.9.1"],"fixed":["6.9.1"]}]},{"id":"PYSEC-2026-3023","url":"https://osv.dev/vulnerability/PYSEC-2026-3023","summary":"pypdf has inefficient decoding of array-based streams","modified":"2026-07-13T16:33:05.762977103Z","packages":[{"ecosystem":"PyPI","name":"pypdf","purl":"pkg:pypi/pypdf","ranges":["<6.9.1"],"fixed":["6.9.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}