CVE-2026-84311

pypdf is a free and open-source pure-python PDF library. Prior to 6.16.1, an attacker can craft a PDF that causes pypdf/_page.py PageObject._extract_text and PageObject.extract_xform_text to traverse a directed acyclic graph of reused form XObjects in which each form invokes a child multiple times, creating exponentially many traversal paths and causing long runtimes and large memory consumption. This issue is fixed in version 6.16.1.

CVSS v3 3.3 LOW

3.3^/10

CVSS v3 : LOW

Vector :

Exploitability : 1.8 / Impact : 1.4

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact LOW

Scope UNCHANGED

References

Link	Resource
https://github.com/py-pdf/pypdf/commit/d91ab705fd81ed1a9cec175c6958600dea1a4942	Patch
https://github.com/py-pdf/pypdf/pull/3966	Patch
https://github.com/py-pdf/pypdf/releases/tag/6.16.1	Release Notes
https://github.com/py-pdf/pypdf/security/advisories/GHSA-763m-79hh-57f2	Patch Vendor Advisory

Configurations

Configuration 1 (hide)

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

History

05 Oct 2026, 17:42

Type	Values Removed	Values Added
CPE		cpe:2.3:a:pypdf_project:pypdf::::::::
First Time		Pypdf Project Pypdf Project pypdf
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 3.3
References	~~() https://github.com/py-pdf/pypdf/commit/d91ab705fd81ed1a9cec175c6958600dea1a4942 -~~	() https://github.com/py-pdf/pypdf/commit/d91ab705fd81ed1a9cec175c6958600dea1a4942 - Patch
References	~~() https://github.com/py-pdf/pypdf/pull/3966 -~~	() https://github.com/py-pdf/pypdf/pull/3966 - Patch
References	~~() https://github.com/py-pdf/pypdf/releases/tag/6.16.1 -~~	() https://github.com/py-pdf/pypdf/releases/tag/6.16.1 - Release Notes
References	~~() https://github.com/py-pdf/pypdf/security/advisories/GHSA-763m-79hh-57f2 -~~	() https://github.com/py-pdf/pypdf/security/advisories/GHSA-763m-79hh-57f2 - Patch, Vendor Advisory

Information

Published : 2026-09-01 21:18

Updated : 2026-10-05 17:42

NVD link : CVE-2026-84311

Mitre link : CVE-2026-84311

CVE.ORG link : CVE-2026-84311

JSON object : View

Products Affected

pypdf_project

pypdf

CWE

CWE-834

Excessive Iteration

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