pypdf is a free and open-source pure-python PDF library.

Code

The project this record applies to. Exploit listings stay in References.

• Repository · github.com

Timeline

Detection, updates, and resolution for this record.

1. Mar 20, 2026 · NIST NVD

   Detected

   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.

2. Jun 17, 2026 · NIST NVD

   Updated

   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.

Affected

• cpe pypdf project/pypdfversion unspecified

Sources

• CVE.orgVulnerability recordCVE-2026-33123

  Official CVE identifier

  cve.org
• NIST NVDVulnerability recordCVE-2026-33123

  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 i

  nvd.nist.gov

References

• Issue Tracking · github.com
• Product · github.com
• Patch · github.com