CVE-2026-22691
Published: Jan 10, 2026
Modified: Jan 12, 2026
Description
pypdf is a free and open-source pure-python PDF library. Prior to version 6.6.0, pypdf has possible long runtimes for malformed startxref. An attacker who uses this vulnerability can craft a PDF which leads to possibly long runtimes for invalid startxref entries. When rebuilding the cross-reference table, PDF files with lots of whitespace characters become problematic. Only the non-strict reading mode is affected. Only the non-strict reading mode is affected. This issue has been patched in version 6.6.0.
| Vendor | Product | Versions |
|---|---|---|
py-pdf | pypdf | affected < 6.6.0 |
References
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