| Name | CVE-2026-102997 |
| Description | pypdf is a free and open-source pure-python PDF library. Prior to 6.18.1, a crafted PDF containing a partially malformed /FlateDecode stream with padded data can force pypdf/filters.py to use inefficient byte-by-byte decompression while the earlier recovery counter fails to advance for bytes that successfully decode, causing long runtimes and application unavailability. This is a residual issue after the malformed FlateDecode recovery fix. This issue is fixed in version 6.18.1. |
| 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) |
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 | 6.19.0-1 | fixed |
| sid | 6.21.1-1 | fixed |
| 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) | 6.19.0-1 | | | |
| pypdf2 | source | (unstable) | (unfixed) | | | |
Notes
[trixie] - pypdf <no-dsa> (Minor issue)
[bookworm] - pypdf <postponed> (Minor issue, DoS)
[bookworm] - pypdf2 <postponed> (Minor issue, DoS)
https://github.com/py-pdf/pypdf/security/advisories/GHSA-jw7q-gvrg-4vj3
https://github.com/py-pdf/pypdf/pull/4073
Fixed by: https://github.com/py-pdf/pypdf/commit/d9d38cf99b115deb562d3b68f36c33027bc04f79 (6.18.1)