CVE-2026-102998

pypdf is a free and open-source pure-python PDF library. Prior to 6.19.0, a crafted PDF with form field values can cause pypdf/generic/_appearance_stream.py appearance-stream generation to repeat invariant selection-data work inside a loop when an application updates fields with flattening enabled, resulting in excessive runtimes and application unavailability. This issue is fixed in version 6.19.0.

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/959467a9b95be83e2dc5ae873ece5f371263ede7	Patch
https://github.com/py-pdf/pypdf/pull/4087	Patch Issue Tracking
https://github.com/py-pdf/pypdf/releases/tag/6.19.0	Release Notes
https://github.com/py-pdf/pypdf/security/advisories/GHSA-php9-fj8v-98fj	Vendor Advisory

Configurations

Configuration 1 (hide)

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

History

05 Oct 2026, 15:05

Type	Values Removed	Values Added
First Time		Pypdf Project Pypdf Project pypdf
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 7.5
CPE		cpe:2.3:a:pypdf_project:pypdf::::::::
References	~~() https://github.com/py-pdf/pypdf/commit/959467a9b95be83e2dc5ae873ece5f371263ede7 -~~	() https://github.com/py-pdf/pypdf/commit/959467a9b95be83e2dc5ae873ece5f371263ede7 - Patch
References	~~() https://github.com/py-pdf/pypdf/pull/4087 -~~	() https://github.com/py-pdf/pypdf/pull/4087 - Patch, Issue Tracking
References	~~() https://github.com/py-pdf/pypdf/releases/tag/6.19.0 -~~	() https://github.com/py-pdf/pypdf/releases/tag/6.19.0 - Release Notes
References	~~() https://github.com/py-pdf/pypdf/security/advisories/GHSA-php9-fj8v-98fj -~~	() https://github.com/py-pdf/pypdf/security/advisories/GHSA-php9-fj8v-98fj - Vendor Advisory

30 Sep 2026, 21:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-09-30 21:17

Updated : 2026-10-05 15:05

NVD link : CVE-2026-102998

Mitre link : CVE-2026-102998

CVE.ORG link : CVE-2026-102998

JSON object : View

Products Affected

pypdf_project

pypdf

CWE

CWE-400

Uncontrolled Resource Consumption

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