Vulnerability 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 Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Pypdf Project | Pypdf | < 6.9.1 |
Related Weaknesses (CWE)
References
- https://github.com/py-pdf/pypdf/pull/3686Issue TrackingPatch
- https://github.com/py-pdf/pypdf/releases/tag/6.9.1ProductRelease Notes
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-qpxp-75px-xjcpPatchVendor Advisory
FAQ
What is CVE-2026-33123?
CVE-2026-33123 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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 require...
How severe is CVE-2026-33123?
CVE-2026-33123 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-33123?
Check the references section above for vendor advisories and patch information. Affected products include: Pypdf Project Pypdf.