GHSA-5hx5-vpf9-5wcv

pypdf: Unvalidated JPEG image data loading

Source: GitHub Advisory Database (reviewed) Low CVE-2026-113786

Packages

Ecosystem	Package	Affected	Fixed in
PyPI	pypdf	< 6.21.1	6.21.1

Details

As written in the advisory (Markdown source, shown as plain text).

### 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](https://github.com/py-pdf/pypdf/releases/tag/6.21.1). ### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#4222](https://github.com/py-pdf/pypdf/pull/4222).

References

External links from the advisory. They lead to third-party sites.

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