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CVE-2026-113790

pypdf: Possible large memory usage when parsing arrays and dictionaries

MEDIUM
6
CVSS Score
Published: October 21, 2026 at 03:35 PM UTC
Updated: October 28, 2026 at 02:17 AM UTC
1 product affected across 1 vendorPypdf

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Severity
MEDIUM6
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Pypdf· Py PDF
90%
v < 6.21.0

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (4)

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

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6MEDIUMGitHub_M
Vector?

Quick Info

StatusUNDERGOING ANALYSIS
CWE
CWE-400CWE-770

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