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BREW-pdfalyzer-CVE-2026-28351 — pypdf: Manipulated RunLengthDecode streams can exhaust RAM

2026-10-03T12:29:26.111133+00:00

Affected: Homebrew: pdfalyzer

### Impact

An attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing the content stream using the RunLengthDecode filter.

### Patches This has been fixed in [pypdf==6.7.4](https://github.com/py-pdf/pypdf/releases/tag/6.7.4).

### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#3664](https://github.com/py-pdf/pypdf/pull/3664).

CVE-2026-28351 — Manipulated RunLengthDecode streams can exhaust RAM

2026-10-03T12:29:26.111214+00:00

Affected: py-pdf pypdf

pypdf is a free and open-source pure-python PDF library. Prior to version 6.7.4, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing the content stream using the RunLengthDecode filter. This has been fixed in pypdf 6.7.4. As a workaround, consider applying the changes from PR #3664.

GHSA-f2v5-7jq9-h8cg — pypdf: Manipulated RunLengthDecode streams can exhaust RAM

2026-10-03T12:29:26.111291+00:00

Affected: PyPI: pypdf

### Impact

An attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing the content stream using the RunLengthDecode filter.

### Patches This has been fixed in [pypdf==6.7.4](https://github.com/py-pdf/pypdf/releases/tag/6.7.4).

### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#3664](https://github.com/py-pdf/pypdf/pull/3664).