CVE-2026-59937CWE-400

pypdf: Possible long runtimes for repeated malformed cross-reference entries

Medium · published July 8, 2026

CVSS v4.0
6.9
EPSS
1%
Percentile
49.0
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 repeated malformed cross-reference streams that cause pypdf to spend long runtimes recovering broken cross-reference table entries. 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
0.00620 · 49.0th percentile
Weakness
CWE-400 · Uncontrolled Resource Consumption
Published
2026-07-08T17:25Z
EPSS history
Timeline
  • 08 JUL 17:25Z
    pypdf: Possible long runtimes for repeated malformed cross-reference entries
    cvelistv5