CVE-2026-113789

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

Published Oct 21, 2026 CVSS 4.0 · 6 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-6vvc-x485-93v7 pypdf: Possible long runtimes/large memory usage when retrieving form fields
History
Type Values Removed Values Added
CPEs cpe:2.3:a:py-pdf:pypdf:*:*:*:*:*:python:*:*
Metrics cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'}

cvssV3_1

{'score': 3.3, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L'}

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Weaknesses CWE-770
References
Metrics threat_severity

None

cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'}

threat_severity

Moderate

Type Values Removed Values Added
First Time appeared Py-pdf
Py-pdf pypdf
Vendors & Products Py-pdf
Py-pdf pypdf
Type Values Removed Values Added
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.
Title pypdf: Possible long runtimes/large memory usage when retrieving form fields
Weaknesses CWE-400
CWE-407
References
Metrics cvssV4_0

{'score': 6, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Oct 28, 2026, 4:42 PM
Reserved
Oct 20, 2026, 5:39 PM
Status
Analyzed
Published
Oct 21, 2026, 4:17 PM
Modified
Nov 2, 2026, 4:12 PM
Severity
Moderate
Public date
Oct 21, 2026, 3:33 PM