Description
pypdf is a free and open-source pure-python PDF library. Prior to version 6.0.0, an attacker can craft a PDF which leads to the RAM being exhausted. This requires just reading the file if a series of FlateDecode filters is used on a malicious cross-reference stream. Other content streams are affected on explicit access. This issue has been fixed in 6.0.0. If an update is not possible, a workaround involves including the fixed code from pypdf.filters.decompress into the existing filters file.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| py-pdf | pypdf | < 6.0.0 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | pypdf | 6.9.0-1 | — |
| Debian 13 | pypdf | No fix yet | — |
| Debian 12 | pypdf +1 | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | pypdf | No fix yet | — |
| Ubuntu 26.04 LTS | pypdf | No fix yet | — |
| Ubuntu 25.10 | pypdf | No fix yet | — |
| Ubuntu 24.04 LTS | pypdf +1 | No fix yet | — |
| Ubuntu 22.04 LTS | pypdf2 | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | pypdf2 | No fix yet | — |
| Ubuntu Pro 18.04 LTS | pypdf2 | No fix yet | — |
| Ubuntu Pro 16.04 LTS | pypdf2 | No fix yet | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | python-PyPDF2 | 2.11.1-4.1 | openSUSE-SU-2026:10238-1 |
| openSUSE Tumbleweed | python-pypdf | 6.0.0-1.1 | openSUSE-SU-2025:15439-1 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | open-webui +1 | 0.6.22-r1 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | pypdf | < 6.0.0 | 6.0.0 | GHSA-7hfw-26vp-jp8m |
Advisories 3
- WID-SEC-2026-1730 Xerox FreeFlow Print Server: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff BSI CERT-Bund (WID) · Jul 16, 2026
- openSUSE-SU-2026:10238-1 python311-PyPDF2-2.11.1-4.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2025:15439-1 python311-pypdf-6.0.0-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
References
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-7hfw-26vp-jp8m
- https://github.com/py-pdf/pypdf/issues/3429
- https://github.com/py-pdf/pypdf/pull/3430
- https://github.com/py-pdf/pypdf/blob/0dd57738bbdcdb63f0fb43d8a6b3d222b6946595/pypdf/filters.py#L72-L143
- https://github.com/py-pdf/pypdf/releases/tag/6.0.0