CVE-2026-27628CWE-835

pypdf has a possible infinite loop when loading circular /Prev entries in cross-reference streams

Low · published February 25, 2026

CVSS v4.0
1.2
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 6.7.2, an attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires reading the file. This has been fixed in pypdf 6.7.2. As a workaround, one may apply the patch manually.

The record
Technical detail
CVSS v4.0
1.2 · LOW
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U
EPSS
0.00619 · 49.0th percentile
Weakness
CWE-835 · Loop with Unreachable Exit Condition ('Infinite Loop')
Published
2026-02-25T02:45Z
EPSS history
Timeline
  • 25 FEB 02:45Z
    pypdf has a possible infinite loop when loading circular /Prev entries in cross-reference streams
    cvelistv5