CVE-2026-113789

pypdf: Possible long runtimes/large memory usage when retrieving form fields

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 that causes large memory usage or long runtimes when an application retrieves the document's form fields. 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-407 Inefficient Algorithmic Complexity

Affected Products

Product	Versions
pypdfpy-pdf	< 6.21.0Affected

References

https://github.com/py-pdf/pypdf/security/advisories/GHSA-6vvc-x485-93v7
https://github.com/py-pdf/pypdf/pull/4219
https://github.com/py-pdf/pypdf/commit/5ef728f0e16d225c853e89f861ba0a67402fe3f2
https://github.com/py-pdf/pypdf/releases/tag/6.21.0

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