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BREW-pdfalyzer-CVE-2026-28804 — pypdf vulnerable to inefficient decoding of ASCIIHexDecode streams

2026-10-03T05:45:09.006694+00:00

Affected: Homebrew: pdfalyzer

### Impact An attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires accessing a stream which uses the `/ASCIIHexDecode` filter.

### Patches This has been fixed in [pypdf==6.7.5](https://github.com/py-pdf/pypdf/releases/tag/6.7.5).

### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#3666](https://github.com/py-pdf/pypdf/pull/3666).

CVE-2026-28804 — pypdf: Inefficient decoding of ASCIIHexDecode streams

2026-10-03T05:45:09.006744+00:00

Affected: py-pdf pypdf

pypdf is a free and open-source pure-python PDF library. Prior to version 6.7.5, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires accessing a stream which uses the /ASCIIHexDecode filter. This issue has been patched in version 6.7.5.

GHSA-9m86-7pmv-2852 — pypdf vulnerable to inefficient decoding of ASCIIHexDecode streams

2026-10-03T05:45:09.006772+00:00

Affected: PyPI: pypdf

### Impact An attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires accessing a stream which uses the `/ASCIIHexDecode` filter.

### Patches This has been fixed in [pypdf==6.7.5](https://github.com/py-pdf/pypdf/releases/tag/6.7.5).

### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#3666](https://github.com/py-pdf/pypdf/pull/3666).