CVE-2026-113786: pypdf: Unvalidated JPEG image data loading
Published Oct 21, 2026
·Updated
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 Software
1 affected component
pypi/pypdf<6.21.1
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
pypdfto a version that resolves this vulnerability.Fixed in 6.21.1
Event History
Oct 21, 2026
CVE Published
via MITRE·02:38 PM
Data Sourced
via MITRE·02:38 PM
DescriptionWeakness