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Vulnerability · Published Sep 30, 2026 · Assigned by GitHub_M

CVE-2026-102993pypdf: Possible large memory usage when retrieving Roman page labels

High 8.7

In plain English

A high-severity uncontrolled resource consumption in pypdf from py-pdf. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 28% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)8.7High
Exploit odds (30 days)0.3%top 71.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12pypdfno fix listedDEBIAN-CVE-2026-102993
Debian:13pypdfno fix listedDEBIAN-CVE-2026-102993
Debian:14pypdf6.19.0-1DEBIAN-CVE-2026-102993
PyPIpypdf6.17.0PYSEC-2026-4158
PyPIpypdf6.17.0GHSA-qv6h-rv94-w285
Ubuntu:24.04:LTSpypdfno fix listedUBUNTU-CVE-2026-102993
Ubuntu:26.04:LTSpypdfno fix listedUBUNTU-CVE-2026-102993
Ubuntu:26.10pypdfno fix listedUBUNTU-CVE-2026-102993
Ubuntu:22.04:LTSpypdf2no fix listedUBUNTU-CVE-2026-102993
Ubuntu:24.04:LTSpypdf2no fix listedUBUNTU-CVE-2026-102993

Affected products (as reported)

VendorProductVersions
py-pdf pypdf < 6.17.0

Weakness: CWE-400, CWE-770 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References