CVE-2026-59935: pypdf: Possible infinite loop for not terminated inline images (ASCII85 and ASCIIHex filter)

July 23, 2026

An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires parsing the content stream of a page with a not terminated inline image, as done when extracting the page text for example. It only affects the ASCII85 and ASCIIHex filters.

References

github.com/advisories/GHSA-g867-7843-wf8q
github.com/py-pdf/pypdf/commit/5a33a46416aa1ae6c025ff90a3cca57631fdafd2
github.com/py-pdf/pypdf/pull/3892
github.com/py-pdf/pypdf/releases/tag/6.14.2
github.com/py-pdf/pypdf/security/advisories/GHSA-g867-7843-wf8q
nvd.nist.gov/vuln/detail/CVE-2026-59935

Code Behaviors & Features

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