CVE-2026-102996

HIGHCVSS 7.5

Description

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.

Timeline

Published:September 30th, 2026 9:17 PM

Last modified:November 2nd, 2026 4:06 PM

CVSS Scoring

CVSS v3: 7.5 (HIGH)

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Software

From NVD CPE configuration data

Vendors

py-pdf

Products

pypdf

Weaknesses (CWE)

CWE-400

References & Reports

Advisories, patches, and third-party reports

https://github.com/py-pdf/pypdf/commit/0fb26eb8cdd01c44b3b2c9fe8329751be2f7cfd5Patch
https://github.com/py-pdf/pypdf/pull/4072Patch
https://github.com/py-pdf/pypdf/releases/tag/6.18.1Release Notes
https://github.com/py-pdf/pypdf/security/advisories/GHSA-g9cg-prrw-2r8qVendor Advisory

Source: NIST NVD · Data may lag official sources by up to one minute