CVE-2026-27628 LOW

CVE-2026-27628: pypdf has a possible infinite loop when loading circular /Prev entries in cross-reference streams

Vendor Py-Pdf
Product pypdf
Weakness CWE-835
Published February 25, 2026
Last update February 27, 2026
View on NVD All CVEs

CVSS base score

1.2/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction —
Confidentiality —
Integrity —

CVSS 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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

February 25, 2026 CVE published
February 27, 2026 Record updated