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CVE-2026-41313

pypdf: Possible long runtimes for wrong size values in incremental mode

Published: Apr 22, 2026Updated: Apr 27, 2026 Sources: CVE List NVDCWE-834
NVD MITRE
6.5CVSSMEDIUM
EPSS Score
0.2%
Top 88.4%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

pypdf is a free and open-source pure-python PDF library. An attacker who uses a vulnerability present in versions prior to 6.10.2 can craft a PDF which leads to long runtimes. This requires loading a PDF with a large trailer `/Size` value in incremental mode. This has been fixed in pypdf 6.10.2. As a workaround, one may apply the changes from the patch manually.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:RS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-834

Affected Products

pypdfpypdf project
Library
OSS Libraries / generic-library
pypdfpy-pdf
On-prem
OSS Libraries / pypi
pypdf projectoss-projectOSS Libraries
py-pdfpackage-ecosystemOSS Librariesaka pypdf, pypdf2

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://github.com/py-pdf/pypdf/commit/c50a0104cf083356f7c7f5d61410466a57f5c88a
github.com
https://github.com/py-pdf/pypdf/pull/3735
github.com
https://github.com/py-pdf/pypdf/releases/tag/6.10.2
github.com
and 1 more references View all →

Timeline

Published
Apr 22, 2026
Last Updated
Apr 27, 2026

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