CVE-2026-59938CWE-789

pypdf: Possible large memory usage for wrong image dimensions

Medium · published July 8, 2026

CVSS v4.0
6.9
EPSS
1%
Percentile
43.0
In the wild
Unconfirmed
What it is

pypdf is a free and open-source pure-python PDF library. Prior to 6.14.0, an attacker can craft a PDF with declared image size values that are much too large compared to the actual data, causing large memory usage in pypdf image parsing. This issue is fixed in version 6.14.0.

The record
Technical detail
CVSS v4.0
6.9 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
EPSS
0.00515 · 43.0th percentile
Weakness
CWE-789 · Memory Allocation with Excessive Size Value
Published
2026-07-08T17:24Z
EPSS history
Timeline
  • 08 JUL 17:24Z
    pypdf: Possible large memory usage for wrong image dimensions
    cvelistv5