| Name | CVE-2026-82398 |
| Description | pypdf is a free and open-source pure-python PDF library. Prior to 6.15.0, an attacker can craft a PDF that causes long runtimes when the pypdf/_utils.py function read_until_whitespace reads a stream containing a long run of bytes without whitespace. The function repeatedly performs immutable bytes concatenation in a one-byte loop, causing quadratic processing cost for the long non-whitespace input. This issue is fixed in version 6.15.0. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 1146476 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| pypdf (PTS) | bookworm | 3.4.1-1+deb12u1 | vulnerable |
| trixie | 5.4.0-1 | vulnerable |
| forky, sid | 6.9.2-2 | vulnerable |
| pypdf2 (PTS) | bookworm | 2.12.1-3+deb12u1 | vulnerable |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| pypdf | source | (unstable) | (unfixed) | | | 1146476 |
| pypdf2 | source | (unstable) | (unfixed) | | | |
Notes
[trixie] - pypdf <no-dsa> (Minor issue)
[bookworm] - pypdf <postponed> (Minor issue)
[bookworm] - pypdf2 <postponed> (Minor issue, DoS)
https://github.com/py-pdf/pypdf/security/advisories/GHSA-fc8x-2rww-xw9m
https://github.com/py-pdf/pypdf/pull/3947
Fixed by: https://github.com/py-pdf/pypdf/commit/4959848e057e37c218dccad7465259210923faaa (6.15.0)