CVE-2026-22691
MEDIUMpypdf <6.6.0 - Info Disclosure
Title source: llmDescription
pypdf is a free and open-source pure-python PDF library. Prior to version 6.6.0, pypdf has possible long runtimes for malformed startxref. An attacker who uses this vulnerability can craft a PDF which leads to possibly long runtimes for invalid startxref entries. When rebuilding the cross-reference table, PDF files with lots of whitespace characters become problematic. Only the non-strict reading mode is affected. Only the non-strict reading mode is affected. This issue has been patched in version 6.6.0.
Scores
CVSS v3
5.3
EPSS
0.0002
EPSS Percentile
4.6%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Classification
CWE
CWE-1333
CWE-400
Status
published
Affected Products (2)
pypdf_project/pypdf
< 6.6.0
pypi/pypdf
< 6.6.0PyPI
Timeline
Published
Jan 10, 2026
Tracked Since
Feb 18, 2026