Moderate severityNVD Advisory· Published Mar 20, 2026· Updated Mar 20, 2026
pypdf has inefficient decoding of array-based streams
CVE-2026-33123
Description
pypdf is a free and open-source pure-python PDF library. Versions prior to 6.9.1 allow an attacker to craft a malicious PDF which leads to long runtimes and/or large memory usage. Exploitation requires accessing an array-based stream with many entries. This issue has been fixed in version 6.9.1.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
pypdfPyPI | < 6.9.1 | 6.9.1 |
Affected products
6- osv-coords5 versionspkg:apk/chainguard/litellmpkg:pypi/pypdfpkg:rpm/opensuse/python-PyPDF2&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/python-PyPDF2&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/python-pypdf&distro=openSUSE%20Tumbleweed
< 1.82.3.0-r0+ 4 more
- (no CPE)range: < 1.82.3.0-r0
- (no CPE)range: < 6.9.1
- (no CPE)range: < 2.11.1-bp160.5.1
- (no CPE)range: < 2.11.1-8.1
- (no CPE)range: < 6.9.1-1.1
Patches
Vulnerability mechanics
References
5- github.com/advisories/GHSA-qpxp-75px-xjcpghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-33123ghsaADVISORY
- github.com/py-pdf/pypdf/pull/3686ghsax_refsource_MISCWEB
- github.com/py-pdf/pypdf/releases/tag/6.9.1ghsax_refsource_MISCWEB
- github.com/py-pdf/pypdf/security/advisories/GHSA-qpxp-75px-xjcpghsax_refsource_CONFIRMWEB
News mentions
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