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VULNERABILITIES

CVE-2026-119209 Details

Description

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:5.5 MEDIUMVector:CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://github.com/py-pdf/pypdf/commit/a93fe3a901fd00af38f0a105c3ba7175fa72dcb4 [email protected]Patch
https://github.com/py-pdf/pypdf/pull/4269 [email protected]Patch
https://github.com/py-pdf/pypdf/releases/tag/6.21.3 [email protected]Release Notes
https://github.com/py-pdf/pypdf/security/advisories/GHSA-x3rh-gjgm-fmqc [email protected]PatchVendor Advisory

Weakness Enumeration

CWE-IDCWE NameSource
CWE-400Uncontrolled Resource Consumption[email protected]
CWE-770Allocation of Resources Without Limits or Throttling[email protected]

Affected Products

ProductVersions
py-pdf pypdf
< 6.21.3

CPE

  • cpe:2.3:a:py-pdf:pypdf:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

4 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-119209
NVD Published Date:
Oct 29, 2026
NVD Last Modified:
Nov 2, 2026
Source:
[email protected]
CVE-2026-119209 Details - Not Deferred