CVE-2026-33699CWE-835

pypdf: Possible infinite loop during recovery attempts in DictionaryObject.read_from_stream

Medium · published March 26, 2026

CVSS v4.0
4.6
EPSS
1%
Percentile
47.1
In the wild
Unconfirmed
What it is

pypdf is a free and open-source pure-python PDF library. Versions prior to 6.9.2 have a vulnerability in which an attacker can craft a PDF which leads to an infinite loop. This requires reading a file in non-strict mode. This has been fixed in pypdf 6.9.2. If users cannot upgrade yet, consider applying the changes from the patch manually.

The record
Technical detail
CVSS v4.0
4.6 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U
EPSS
0.00583 · 47.1th percentile
Weakness
CWE-835 · Loop with Unreachable Exit Condition ('Infinite Loop')
Published
2026-03-26T23:58Z
EPSS history
Timeline
  • 26 MAR 23:58Z
    pypdf: Possible infinite loop during recovery attempts in DictionaryObject.read_from_stream
    cvelistv5