HIGH

GHSA-g867-7843-wf8q

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

Quick fix

GHSA-g867-7843-wf8q — pypdf: upgrade to the fixed version with the command below.

pip install --upgrade 'pypdf>=6.14.2'

Details

### Impact

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.

### Patches

This has been fixed in [pypdf==6.14.2](https://github.com/py-pdf/pypdf/releases/tag/6.14.2).

### Workarounds

If you cannot upgrade yet, consider applying the changes from PR [#3892](https://github.com/py-pdf/pypdf/pull/3892).

Are you affected?

Enter the version of the package you're using.

Affected packages

PyPI / pypdf

Introduced in: 0 Fixed in: 6.14.2

Fix pip install --upgrade 'pypdf>=6.14.2'

References

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