CVE-2026-24688

pypdf is a free and open-source pure-python PDF library. An attacker who uses an infinite loop vulnerability that is present in versions prior to 6.6.2 can craft a PDF which leads to an infinite loop. This requires accessing the outlines/bookmarks. This has been fixed in pypdf 6.6.2. If projects cannot upgrade yet, consider applying the changes from PR #3610 manually.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/py-pdf/pypdf/commit/b1282f8dcdc1a7b41ceab6740ffddfdf31b1fec1	Patch
https://github.com/py-pdf/pypdf/pull/3610	Issue Tracking
https://github.com/py-pdf/pypdf/releases/tag/6.6.2	Product Release Notes
https://github.com/py-pdf/pypdf/security/advisories/GHSA-2q4j-m29v-hq73	Vendor Advisory

Configurations

Configuration 1 (hide)

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

History

06 Feb 2026, 18:27

Type	Values Removed	Values Added
References	~~() https://github.com/py-pdf/pypdf/commit/b1282f8dcdc1a7b41ceab6740ffddfdf31b1fec1 -~~	() https://github.com/py-pdf/pypdf/commit/b1282f8dcdc1a7b41ceab6740ffddfdf31b1fec1 - Patch
References	~~() https://github.com/py-pdf/pypdf/pull/3610 -~~	() https://github.com/py-pdf/pypdf/pull/3610 - Issue Tracking
References	~~() https://github.com/py-pdf/pypdf/releases/tag/6.6.2 -~~	() https://github.com/py-pdf/pypdf/releases/tag/6.6.2 - Product, Release Notes
References	~~() https://github.com/py-pdf/pypdf/security/advisories/GHSA-2q4j-m29v-hq73 -~~	() https://github.com/py-pdf/pypdf/security/advisories/GHSA-2q4j-m29v-hq73 - Vendor Advisory
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 7.5
First Time		Pypdf Project Pypdf Project pypdf
CPE		cpe:2.3:a:pypdf_project:pypdf::::::::

27 Jan 2026, 20:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-01-27 20:16

Updated : 2026-02-06 18:27

NVD link : CVE-2026-24688

Mitre link : CVE-2026-24688

CVE.ORG link : CVE-2026-24688

JSON object : View

Products Affected

pypdf_project

pypdf

CWE

CWE-835

Loop with Unreachable Exit Condition ('Infinite Loop')

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