CVE-2026-27024CWE-835

pypdf has a possible infinite loop when processing TreeObject

Medium · published February 20, 2026

CVSS v4.0
6.9
EPSS
0%
Percentile
10.1
In the wild
Unconfirmed
What it is

pypdf is a free and open-source pure-python PDF library. Prior to 6.7.1, an attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires accessing the children of a TreeObject, for example as part of outlines. This vulnerability is fixed in 6.7.1.

The record
Technical detail
CVSS v4.0
6.9 · MEDIUM
Vector
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
EPSS
0.00206 · 10.1th percentile
Weakness
CWE-835 · Loop with Unreachable Exit Condition ('Infinite Loop')
Published
2026-02-20T21:10Z
EPSS history
Timeline
  • 20 FEB 21:10Z
    pypdf has a possible infinite loop when processing TreeObject
    cvelistv5