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

October 21, 2026

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.

References

github.com/advisories/GHSA-5hx5-vpf9-5wcv
github.com/py-pdf/pypdf/commit/512d8eb94eb04be1d1c90504e6da2dcef8679e07
github.com/py-pdf/pypdf/pull/4222
github.com/py-pdf/pypdf/releases/tag/6.21.1
github.com/py-pdf/pypdf/security/advisories/GHSA-5hx5-vpf9-5wcv
nvd.nist.gov/vuln/detail/CVE-2026-113786

Code Behaviors & Features

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