CVE-2026-59937
HIGHpypdf: Possible long runtimes for repeated malformed cross-reference entries
Title source: cnaDescription
pypdf is a free and open-source pure-python PDF library. Prior to 6.14.0, an attacker can craft a PDF with repeated malformed cross-reference streams that cause pypdf to spend long runtimes recovering broken cross-reference table entries. This issue is fixed in version 6.14.0.
References (4)
Core 4
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/py-pdf/pypdf/security/advisories/GHSA-55h5-xmcq-c37v
X_Refsource_Misc x_refsource_misc
https://github.com/py-pdf/pypdf/pull/3887
X_Refsource_Misc x_refsource_misc
https://github.com/py-pdf/pypdf/commit/b5fc5aa714f4b696fb9b1deaa35a9e4a4eb50dae
X_Refsource_Misc x_refsource_misc
https://github.com/py-pdf/pypdf/releases/tag/6.14.0
Scores
CVSS v3
7.5
EPSS
0.0034
EPSS Percentile
26.7%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-400
Status
published
Products (3)
py-pdf/pypdf
< 6.14.0
pypdf_project/pypdf
< 6.14.0
pypi/pypdf
0 - 6.14.0PyPI
Published
Jul 08, 2026
Tracked Since
Jul 08, 2026