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Vulnerability · Published Jul 8, 2026 · Assigned by GitHub_M

CVE-2026-59938pypdf: Possible large memory usage for wrong image dimensions

Medium 6.9

In plain English

A medium-severity security flaw 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 0.5% (higher than 44% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)6.9Medium
Exploit odds (30 days)0.5%top 55.9% 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 6.14.0, an attacker can craft a PDF with declared image size values that are much too large compared to the actual data, causing large memory usage in pypdf image parsing. This issue is fixed in version 6.14.0.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12pypdfno fix listedDEBIAN-CVE-2026-59938
Debian:13pypdfno fix listedDEBIAN-CVE-2026-59938
Debian:14pypdf6.19.0-1DEBIAN-CVE-2026-59938
Debian:12pypdf2no fix listedDEBIAN-CVE-2026-59938
PyPIpypdf6.14.0GHSA-5qjq-93h5-hrgp
PyPIpypdf6.14.0PYSEC-2026-3611
Ubuntu:24.04:LTSpypdfno fix listedUBUNTU-CVE-2026-59938
Ubuntu:25.10pypdfno fix listedUBUNTU-CVE-2026-59938
Ubuntu:26.04:LTSpypdfno fix listedUBUNTU-CVE-2026-59938
Ubuntu:26.10pypdfno fix listedUBUNTU-CVE-2026-59938
Ubuntu:22.04:LTSpypdf2no fix listedUBUNTU-CVE-2026-59938
Ubuntu:24.04:LTSpypdf2no fix listedUBUNTU-CVE-2026-59938

Affected products (as reported)

VendorProductVersions
py-pdf pypdf < 6.14.0

Weakness: CWE-789 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

References