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CVE-2026-102993

pypdf: Possible large memory usage when retrieving Roman page labels

CVSS 4.0 8.7 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.

cve-program · CVE-2026-102993

Published

pypdf is a free and open-source pure-python PDF library. Prior to 6.17.0, a crafted PDF can provide unusually large Roman page-label values that cause pypdf/_page_labels.py to generate excessively large numeral strings when an application retrieves document page labels, consuming large amounts of memory and potentially making the application unavailable. This issue is fixed in version 6.17.0.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-102993

Published

pypdf

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "py-pdf",
                    "product": "pypdf",
                    "versions": [
                        {
                            "version": "< 6.17.0",
                            "status": "affected"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON