PyPDF2 quadratic runtime with malformed PDF missing xref marker

TRUNG BÌNH 6.5CVE-2023-36810 · GHSA-jrm6-h9cq-8gqw · PYSEC-2026-1837 · Công bố 30/06/2023 · cập nhật 17/06/2026

Tóm tắt nhanh

CVE-2023-36810 là lỗ hổng mức TRUNG BÌNH (CVSS 6.5) ảnh hưởng pypdf2, pypdf (pypdf project).
Xác suất bị khai thác trong 30 ngày tới (EPSS): 0.63%, cao hơn 50.2% các lỗ hổng khác.
Cách xử lý: cập nhật lên 1.27.9 hoặc mới hơn.

Gói / sản phẩm	Phiên bản bị ảnh hưởng	Phiên bản đã vá
pypdf2 PyPI	`< 1.27.9`	`1.27.9`
pypdf pypdf_project	`≤ 1.27.8`	Chưa có bản vá

Mô tả

Impact

An attacker who uses this vulnerability can craft a PDF which leads to unexpected long runtime. This quadratic runtime blocks the current process and can utilize a single core of the CPU by 100%. It does not affect memory usage.

Patches

https://github.com/py-pdf/pypdf/pull/808

Workarounds

Is there a way for users to fix or remediate the vulnerability without upgrading?

References

Mô tả của NVD

pypdf is a pure-python PDF library capable of splitting, merging, cropping, and transforming the pages of PDF files. An attacker who uses this vulnerability can craft a PDF which leads to unexpected long runtime. This quadratic runtime blocks the current process and can utilize a single core of the CPU by 100%. It does not affect memory usage. This issue has been addressed in PR 808 and versions from 1.27.9 include this fix. Users are advised to upgrade. There are no known workarounds for this vulnerability.