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CVE-2026-27888 — pypdf: Manipulated FlateDecode XFA streams can exhaust RAM

2026-09-28T20:47:49.669432+00:00

Affected: py-pdf pypdf

pypdf is a free and open-source pure-python PDF library. Prior to 6.7.3, an attacker who uses this vulnerability can craft a PDF which leads to the RAM being exhausted. This requires accessing the `xfa` property of a reader or writer and the corresponding stream being compressed using `/FlateDecode`. This has been fixed in pypdf 6.7.3. As a workaround, apply the patch manually.

GHSA-x7hp-r3qg-r3cj — pypdf: Manipulated FlateDecode XFA streams can exhaust RAM

2026-09-28T20:47:49.669539+00:00

Affected: PyPI: pypdf

### Impact An attacker who uses this vulnerability can craft a PDF which leads to the RAM being exhausted. This requires accessing the `xfa` property of a reader or writer and the corresponding stream being compressed using `/FlateDecode`.

### Patches This has been fixed in [pypdf==6.7.3](https://github.com/py-pdf/pypdf/releases/tag/6.7.3).

### Workarounds If projects cannot upgrade yet, consider applying the changes from PR [#3658](https://github.com/py-pdf/pypdf/pull/3658).

PYSEC-2026-3027 — pypdf: Manipulated FlateDecode XFA streams can exhaust RAM

2026-09-28T20:47:49.669628+00:00

Affected: PyPI: pypdf

### Patches This has been fixed in [pypdf==6.7.3](https://github.com/py-pdf/pypdf/releases/tag/6.7.3).

### Workarounds If projects cannot upgrade yet, consider applying the changes from PR [#3658](https://github.com/py-pdf/pypdf/pull/3658).