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

6.5MEDIUM

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.

No summary for this CVE yet.

CVSS Vector Breakdown

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

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Weaknesses

CWE-834

Affected Products

pypdf project

oss-project

pypdfLibrary

OSS Libraries / generic-library

py-pdf

package-ecosystemaka pypdf, pypdf2

pypdfOn-prem

OSS Libraries / pypi

Exploitability

Official Patch Available

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique

Impact

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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 →

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