CVE-2026-59937

Summary

pypdf is a free and open-source pure-python PDF library. Prior to 6.14.0, an attacker can craft a PDF with repeated malformed cross-reference streams that cause pypdf to spend long runtimes recovering broken cross-reference table entries. This issue is fixed in version 6.14.0.

Affected Software

Weaknesses

• CWE-400: CWE-400: Uncontrolled Resource Consumption

References

• https://github.com/py-pdf/pypdf/security/advisories/GHSA-55h5-xmcq-c37v
• https://github.com/py-pdf/pypdf/pull/3887
• https://github.com/py-pdf/pypdf/commit/b5fc5aa714f4b696fb9b1deaa35a9e4a4eb50dae
• https://github.com/py-pdf/pypdf/releases/tag/6.14.0

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