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CVE-2026-113792

pypdf: Possible infinite loop in PdfWriter.find_outline_item

MEDIUM
6
CVSS Score
Published: October 21, 2026 at 03:55 PM UTC
Updated: October 23, 2026 at 04:16 PM UTC
1 product affected across 1 vendorPypdf

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Severity
MEDIUM6
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

Description

pypdf is a free and open-source pure-python PDF library. Prior to 6.20.1, calling PdfWriter.find_outline_item on a crafted PDF with a cyclic outline hierarchy can enter an infinite loop and block the current process. This issue is fixed in version 6.20.1.

Affected

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

Pypdf· Py PDF
90%
v < 6.20.1

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-qfv9-64jg-mh7p
x_refsource_MISC
Source: cverecord
https://github.com/py-pdf/pypdf/pull/4188
x_refsource_MISC
Source: cverecord
https://github.com/py-pdf/pypdf/commit/c9c35b4471c2eb5fe078094f6c816e69d4ed25a0
x_refsource_MISC
Source: cverecord
https://github.com/py-pdf/pypdf/releases/tag/6.20.1

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-835

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