pypdf: Possible large memory usage when parsing font data

CAO 7.5CVE-2026-102996 · GHSA-g9cg-prrw-2r8q · PYSEC-2026-4155 · Công bố 30/09/2026 · cập nhật 02/11/2026

Tóm tắt nhanh

CVE-2026-102996 là lỗ hổng mức CAO (CVSS 7.5) ảnh hưởng pypdf, pypdf (py-pdf).
Xác suất bị khai thác trong 30 ngày tới (EPSS): 0.34%, cao hơn 27.6% các lỗ hổng khác.
Cách xử lý: cập nhật lên 6.18.1 hoặc mới hơn.

Gói / sản phẩm	Phiên bản bị ảnh hưởng	Phiên bản đã vá
pypdf PyPI	`< 6.18.1`	`6.18.1`
pypdf py-pdf	`< 6.18.1`	`6.18.1`

Mô tả

Impact

An attacker who uses this vulnerability can craft a PDF which leads to large memory consumption. This requires parsing the /Widths entry of a TrueType or Type1 fonts with unusually large values, for example during text extraction.

Patches

This has been fixed in pypdf==6.18.1.

Workarounds

If you cannot upgrade yet, consider applying the changes from PR #4072.

Mô tả của NVD

pypdf is a free and open-source pure-python PDF library. Prior to 6.18.1, a crafted PDF can provide a TrueType or Type1 simple font with an unusually large /Widths array, causing pypdf/_font.py Font._collect_tt_t1_character_widths to process entries beyond the 256 character codes meaningful for a simple font and consume excessive memory during operations such as text extraction. This issue is fixed in version 6.18.1.