GitHub Advisoryadvisory · PyPI

GHSA-5hx5-vpf9-5wcv pypdf: Unvalidated JPEG image data loading

LOW Published 2026-10-21 Modified 2026-10-21 Official page ↗
Aliases
CVE-2026-113786
Ecosystem
PyPI
Packages
pypdf
Severity
Low
CVSS 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
Weaknesses
CWE-183, CWE-20
Reviewed
2026-10-21

Affected packages

• PyPI pypdf: < 6.21.1 → fixed in 6.21.1

Description

Impact An attacker who uses this vulnerability can craft a PDF which leads to arbitrary image parsers being called. This requires loading an image which claims to use the `/DCTDecode` filter (JPEG data). Users which do not have the optional *Pillow* dependency installed in their environment are not affected. Patches This has been fixed in pypdf==6.21.1. Workarounds If you cannot upgrade yet, consider applying the changes from PR #4222.

Related

Alias · CVE (1)

  • CVE-2026-113786 pypdf is a free and open-source pure-python PDF library. vulnerability

Weakness · CWE (2)

  • CWE-183 Permissive List of Allowed Inputs weakness
  • CWE-20 Improper Input Validation weakness

References