CVE-2026-33123pypdf is a free and open-source pure-python PDF library.
Updated under an hour ago ()
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It affects pypdf_project pypdf. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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
- 6.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-400, CWE-407
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Jun 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
pypdf_project pypdf pypdf_project:pypdf | before 6.9.1 | NVD |
References
- https://github.com/py-pdf/pypdf/pull/3686issue-tracking, patch
- https://github.com/py-pdf/pypdf/releases/tag/6.9.1product, release-notes
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-qpxp-75px-xjcppatch, vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.