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Vulnerability · Published Oct 21, 2026 · Assigned by GitHub_M

CVE-2026-113786pypdf: Unvalidated JPEG image data loading

Low 2.3

In plain English

A low-severity improper input validation 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 0.4% (higher than 35% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)2.3Low
Exploit odds (30 days)0.4%top 65.1% 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 6.21.1, an attacker can craft a PDF containing image data labeled with the /DCTDecode filter that causes Pillow to select and invoke an unintended image parser when the image is loaded. Environments without the optional Pillow dependency are not affected. This issue is fixed in version 6.21.1.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12pypdfno fix listedDEBIAN-CVE-2026-113786
Debian:13pypdfno fix listedDEBIAN-CVE-2026-113786
Debian:14pypdf6.21.1-1DEBIAN-CVE-2026-113786
Debian:12pypdf2no fix listedDEBIAN-CVE-2026-113786
PyPIpypdf6.21.1GHSA-5hx5-vpf9-5wcv
Ubuntu:24.04:LTSpypdfno fix listedUBUNTU-CVE-2026-113786
Ubuntu:26.04:LTSpypdfno fix listedUBUNTU-CVE-2026-113786
Ubuntu:26.10pypdfno fix listedUBUNTU-CVE-2026-113786
Ubuntu:22.04:LTSpypdf2no fix listedUBUNTU-CVE-2026-113786
Ubuntu:24.04:LTSpypdf2no fix listedUBUNTU-CVE-2026-113786

Affected products (as reported)

VendorProductVersions
py-pdf pypdf < 6.21.1

Weakness: CWE-20, CWE-183 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

References