PYSEC-2026-3023
See a problem?- Import Source
- https://github.com/pypa/advisory-database/blob/main/vulns/pypdf/PYSEC-2026-3023.yaml
- JSON Data
- https://api.osv.dev/v1/vulns/PYSEC-2026-3023
- Aliases
- Published
- 2026-07-13T14:36:43.403058Z
- Modified
- 2026-07-13T16:33:05.762977103Z
- Severity
-
- 5.1 (Medium) 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 CVSS Calculator
- Summary
- pypdf has inefficient decoding of array-based streams
- Details
-
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.
Workarounds
If you cannot upgrade yet, consider applying the changes from PR #3686.
- References
-
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-qpxp-75px-xjcp
- https://nvd.nist.gov/vuln/detail/CVE-2026-33123
- https://github.com/py-pdf/pypdf/pull/3686
- https://github.com/py-pdf/pypdf
- https://github.com/py-pdf/pypdf/releases/tag/6.9.1
- https://pypi.org/project/pypdf
- https://github.com/advisories/GHSA-qpxp-75px-xjcp
Affected packages
PyPI / pypdf
Package
- Name
- pypdf
- View open source insights on deps.dev
- Purl
- pkg:pypi/pypdf
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affectedFixed6.9.1
Affected versions
1.*
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
1.10
1.11
1.12
1.13
3.*
3.1.0
3.2.0
3.2.1
3.3.0
3.4.0
3.4.1
3.5.0
3.5.1
3.5.2
3.6.0
3.7.0
3.7.1
3.8.0
3.8.1
3.9.0
3.9.1
3.10.0
3.11.0
3.11.1
3.12.0
3.12.1
3.12.2
3.13.0
3.14.0
3.15.0
3.15.1
3.15.2
3.15.3
3.15.4
3.15.5
3.16.0
3.16.1
3.16.2
3.16.3
3.16.4
3.17.0
3.17.1
3.17.2
3.17.3
3.17.4
4.*
4.0.0
4.0.1
4.0.2
4.1.0
4.2.0
4.3.0
4.3.1
5.*
5.0.0
5.0.1
5.1.0
5.2.0
5.3.0
5.3.1
5.4.0
5.5.0
5.6.0
5.6.1
5.7.0
5.8.0
5.9.0
6.*
6.0.0
6.1.0
6.1.1
6.1.2
6.1.3
6.2.0
6.3.0
6.4.0
6.4.1
6.4.2
6.5.0
6.6.0
6.6.1
6.6.2
6.7.0
6.7.1
6.7.2
6.7.3
6.7.4
6.7.5
6.8.0
6.9.0