CVE-2026-119209

pypdf is a free and open-source pure-python PDF library. Prior to 6.21.3, pypdf can consume excessive memory while opening a crafted PDF containing cross-reference streams that declare very large entry counts. Highly compressible streams and /Prev chains can multiply the number of parsed entries across a document, while negative /Index counts can bypass the existing per-stream clamp. This issue is fixed in version 6.21.3.

CVSS v3 5.5 MEDIUM

5.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/py-pdf/pypdf/commit/a93fe3a901fd00af38f0a105c3ba7175fa72dcb4	Patch
https://github.com/py-pdf/pypdf/pull/4269	Patch
https://github.com/py-pdf/pypdf/releases/tag/6.21.3	Release Notes
https://github.com/py-pdf/pypdf/security/advisories/GHSA-x3rh-gjgm-fmqc	Patch Vendor Advisory

Configurations

Configuration 1 (hide)

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

History

31 Oct 2026, 00:39

Type	Values Removed	Values Added
CPE		cpe:2.3:a:pypdf_project:pypdf::::::::
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 5.5
First Time		Pypdf Project Pypdf Project pypdf
References	~~() https://github.com/py-pdf/pypdf/commit/a93fe3a901fd00af38f0a105c3ba7175fa72dcb4 -~~	() https://github.com/py-pdf/pypdf/commit/a93fe3a901fd00af38f0a105c3ba7175fa72dcb4 - Patch
References	~~() https://github.com/py-pdf/pypdf/pull/4269 -~~	() https://github.com/py-pdf/pypdf/pull/4269 - Patch
References	~~() https://github.com/py-pdf/pypdf/releases/tag/6.21.3 -~~	() https://github.com/py-pdf/pypdf/releases/tag/6.21.3 - Release Notes
References	~~() https://github.com/py-pdf/pypdf/security/advisories/GHSA-x3rh-gjgm-fmqc -~~	() https://github.com/py-pdf/pypdf/security/advisories/GHSA-x3rh-gjgm-fmqc - Patch, Vendor Advisory

29 Oct 2026, 21:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-29 21:17

Updated : 2026-10-31 00:39

NVD link : CVE-2026-119209

Mitre link : CVE-2026-119209

CVE.ORG link : CVE-2026-119209

JSON object : View

Products Affected

pypdf_project

pypdf

CWE

CWE-400

Uncontrolled Resource Consumption

CWE-770

Allocation of Resources Without Limits or Throttling

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