CVE-2026-113790

pypdf: Possible large memory usage when parsing arrays and dictionaries

State: Published
Severity: 6.0 Medium
Published: Oct 21, 2026
Updated: Oct 28, 2026
Reserved: Oct 20, 2026

Description

pypdf is a free and open-source pure-python PDF library. Prior to 6.21.0, an attacker can craft a PDF containing arrays or dictionaries with many elements, causing parsing to consume large amounts of memory. This issue is fixed in version 6.21.0.

Scores

CVSS	Score	Vector	Source
4.0	6.0 Medium	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	GitHub_M

Weaknesses

CWE-400 Uncontrolled Resource Consumption
CWE-770 Allocation of Resources Without Limits or Throttling

Affected Products

Product	Versions
pypdfpy-pdf	< 6.21.0Affected

References

https://github.com/py-pdf/pypdf/security/advisories/GHSA-f54x-cmq8-qg57
https://github.com/py-pdf/pypdf/pull/4218
https://github.com/py-pdf/pypdf/commit/18bd2981a74479483a0b9507602c58a63d6c9b12
https://github.com/py-pdf/pypdf/releases/tag/6.21.0

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