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BREW-pdfalyzer-CVE-2026-33123 — pypdf has inefficient decoding of array-based streams

2026-10-04T01:19:39.628739+00:00

Affected: Homebrew: pdfalyzer

### 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).

CVE-2026-33123 — pypdf has inefficient decoding of array-based streams

2026-10-04T01:19:39.628788+00:00

Affected: py-pdf pypdf

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.

GHSA-qpxp-75px-xjcp — pypdf has inefficient decoding of array-based streams

2026-10-04T01:19:39.628817+00:00

Affected: PyPI: pypdf

### 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).