CVE-2026-41168
MEDIUMpypdf has possible long runtimes for wrong size values in cross-reference and object streams
Title source: cnaDescription
pypdf is a free and open-source pure-python PDF library. An attacker who uses a vulnerability present in versions prior to 6.10.1 can craft a PDF which leads to long runtimes. This requires cross-reference streams with wrong large `/Size` values or object streams with wrong large `/N` values. This has been fixed in pypdf 6.10.1. As a workaround, one may apply the changes from the patch manually.
References (4)
Core 4
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/py-pdf/pypdf/security/advisories/GHSA-jj6c-8h6c-hppx
X_Refsource_Misc x_refsource_misc
https://github.com/py-pdf/pypdf/pull/3733
X_Refsource_Misc x_refsource_misc
https://github.com/py-pdf/pypdf/commit/62338e9d36419cf193ccec7331784f45df1d70b3
X_Refsource_Misc x_refsource_misc
https://github.com/py-pdf/pypdf/releases/tag/6.10.1
Scores
CVSS v3
5.3
EPSS
0.0030
EPSS Percentile
21.1%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-834
Status
published
Products (3)
py-pdf/pypdf
< 6.10.1
pypdf_project/pypdf
< 6.10.1
pypi/pypdf
0 - 6.10.1PyPI
Published
Apr 22, 2026
Tracked Since
Apr 23, 2026