Description
pypdf is a free and open-source pure-python PDF library. Prior to version 6.6.0, pypdf has possible long runtimes for missing /Root object with large /Size values. An attacker who uses this vulnerability can craft a PDF which leads to possibly long runtimes for actually invalid files. This can be achieved by omitting the /Root entry in the trailer, while using a rather large /Size value. Only the non-strict reading mode is affected. This issue has been patched in version 6.6.0.
Details
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Affected Packages
| Software | From version | Fixed in |
|---|---|---|
| pypdf | — | — |
| pypdf2 | — | — |
References
Similar Threats
- Unknown CVE-2026-33123
- Unknown CVE-2026-31826
- Unknown CVE-2026-28804
- Unknown CVE-2026-28351
- Unknown CVE-2026-27888
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