PYSEC-2026-3023
pypdf has inefficient decoding of array-based streams
At a glance
- Published
- Updated
- CVE
- CVE-2026-33123
- Aliases
- GHSA-qpxp-75px-xjcp
- CVSS_V4
- CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Description
### Impact An attacker who uses this vulnerability can craft a PDF which leads to long runtimes and/or large memory usage. This requires accessing an array-based stream with lots of entries. ### Patches This has been fixed in [pypdf==6.9.1](https://github.com/py-pdf/pypdf/releases/tag/6.9.1). ### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#3686](https://github.com/py-pdf/pypdf/pull/3686).
Affected packages
| Package | Versions |
|---|---|
| PyPI · pypdf | introduced 0, fixed 6.9.1 |
References
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-qpxp-75px-xjcp WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-33123 ADVISORY
- https://github.com/py-pdf/pypdf/pull/3686 WEB
- https://github.com/py-pdf/pypdf PACKAGE
- https://github.com/py-pdf/pypdf/releases/tag/6.9.1 WEB
- https://pypi.org/project/pypdf PACKAGE
- https://github.com/advisories/GHSA-qpxp-75px-xjcp ADVISORY
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — PyPA Advisory Database |