Hi,

The following vulnerability was published for pypdf.

CVE-2026-48156[0]:
| pypdf is a free and open-source pure-python PDF library. Prior to
| 6.12.0, an attacker who uses this vulnerability can craft a PDF
| which leads to long runtimes. This requires cross-reference streams
| with /W [0 0 0] values and large /Size values. This vulnerability is
| fixed in 6.12.0.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-48156
https://www.cve.org/CVERecord?id=CVE-2026-48156
[1] https://github.com/py-pdf/pypdf/pull/3791
[2] https://github.com/py-pdf/pypdf/security/advisories/GHSA-248m-82v9-q6g6

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore