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VULNERABILITIES

CVE-2026-22690 Details

Description

pypdf is a free and open-source pure-python PDF library. Prior to version 6.6.0, pypdf has possible long runtimes for missing /Root object with large /Size values. An attacker who uses this vulnerability can craft a PDF which leads to possibly long runtimes for actually invalid files. This can be achieved by omitting the /Root entry in the trailer, while using a rather large /Size value. Only the non-strict reading mode is affected. This issue has been patched in version 6.6.0.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:5.3 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://github.com/py-pdf/pypdf/commit/294165726b646bb7799be1cc787f593f2fdbcf45 [email protected]Patch
https://github.com/py-pdf/pypdf/pull/3594 [email protected]Issue TrackingPatch
https://github.com/py-pdf/pypdf/releases/tag/6.6.0 [email protected]Release Notes
https://github.com/py-pdf/pypdf/security/advisories/GHSA-4xc4-762w-m6cg [email protected]MitigationVendor Advisory

Weakness Enumeration

CWE-IDCWE NameSource
CWE-400Uncontrolled Resource Consumption[email protected]

Affected Products

ProductVersions
pypdf project pypdf
< 6.6.0

CPE

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

Remediation

  • No remediation found in references.

Change History

4 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-22690
NVD Published Date:
Jan 10, 2026
NVD Last Modified:
Jun 17, 2026
Source:
[email protected]
CVE-2026-22690 Details - Not Deferred