pypdf has inefficient decoding of array-based streams
### 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).
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beschreibt (1)
Zugehörige CVEs.
| ID | Schweregrad | ausnutzbar | ||
|---|---|---|---|---|
| CVE-2026-33123US | medium6.5 | — | ||
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.… | ||||
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Referenzen
Externe Belege — Patches, Meldungen, Analysen.
- https://github.com/advisories/GHSA-qpxp-75px-xjcpADVISORY
- https://github.com/py-pdf/pypdfPACKAGE
- https://github.com/py-pdf/pypdf/pull/3686WEB
- https://github.com/py-pdf/pypdf/releases/tag/6.9.1WEB
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-qpxp-75px-xjcpWEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-33123ADVISORY
- https://pypi.org/project/pypdfPACKAGE
scry
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