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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00042.

Exploitation none

Automatable yes

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
py-pdf pypdf affected
Version Status Constraints
< 6.10.1 affected —

Configuration 1 [-]

cpe:2.3:a:pypdf_project:pypdf:*:*:*:*:*:*:*:*

No data.

No data.

Project Subscriptions

Vendors Products
Pypdf Project Subscribe
Pypdf Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/py-pdf/pypdf/commit/62338e9d36419cf193ccec7331784f45df1d70b3 cve-icon cve-icon
https://github.com/py-pdf/pypdf/pull/3733 cve-icon cve-icon
https://github.com/py-pdf/pypdf/releases/tag/6.10.1 cve-icon cve-icon
https://github.com/py-pdf/pypdf/security/advisories/GHSA-jj6c-8h6c-hppx cve-icon cve-icon
History

Fri, 24 Apr 2026 13:15:00 +0000

Type Values Removed Values Added
First Time appeared Pypdf Project
Pypdf Project pypdf
CPEs cpe:2.3:a:pypdf_project:pypdf:*:*:*:*:*:*:*:*
Vendors & Products Pypdf Project
Pypdf Project pypdf
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}

Thu, 23 Apr 2026 17:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 22 Apr 2026 21:00:00 +0000

Type Values Removed Values Added
Description pypdf is a free and open-source pure-python PDF library. An attacker who uses a vulnerability present in versions prior to 6.10.1 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.
Title pypdf has possible long runtimes for wrong size values in cross-reference and object streams
Weaknesses CWE-834
References
Metrics cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-04-23T16:24:48.712Z

Reserved: 2026-04-17T16:34:45.525Z

Link: CVE-2026-41168

cve-icon Vulnrichment

Updated: 2026-04-23T13:41:31.333Z

cve-icon NVD

Status : Analyzed

Published: 2026-04-22T21:17:09.450

Modified: 2026-04-24T13:07:24.000

Link: CVE-2026-41168

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses