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CVE-2025-62708 — pypdf manipulated LZWDecode streams can exhaust RAM

Affected: py-pdf pypdf

pypdf is a free and open-source pure-python PDF library. Prior to version 6.1.3, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing the content stream of a page using the LZWDecode filter. This has been fixed in pypdf version 6.1.3.

GHSA-jfx9-29x2-rv3j — pypdf can exhaust RAM via manipulated LZWDecode streams

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 of a page using the LZWDecode filter.

### Patches This has been fixed in [pypdf==6.1.3](https://github.com/py-pdf/pypdf/releases/tag/6.1.3).

### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#3502](https://github.com/py-pdf/pypdf/pull/3502).

PYSEC-2026-1831 — pypdf can exhaust RAM via manipulated LZWDecode streams

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 of a page using the LZWDecode filter.

### Patches This has been fixed in [pypdf==6.1.3](https://github.com/py-pdf/pypdf/releases/tag/6.1.3).

### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#3502](https://github.com/py-pdf/pypdf/pull/3502).