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CVE-2026-41312 — pypdf: Manipulated FlateDecode predictor parameters can exhaust RAM

2026-09-29T00:46:56.530807+00:00

Affected: py-pdf pypdf

pypdf is a free and open-source pure-python PDF library. An attacker who uses a vulnerability present in versions prior to 6.10.2 can craft a PDF which leads to the RAM being exhausted. This requires accessing a stream compressed using `/FlateDecode` with a `/Predictor` unequal 1 and large predictor parameters. This has been fixed in pypdf 6.10.2. As a workaround, one may apply the changes from the patch manually.

GHSA-7gw9-cf7v-778f — pypdf: Manipulated FlateDecode predictor parameters can exhaust RAM

2026-09-29T00:46:56.530877+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 a stream compressed using `/FlateDecode` with a `/Predictor` unequal 1 and large predictor parameters.

### Patches This has been fixed in [pypdf==6.10.2](https://github.com/py-pdf/pypdf/releases/tag/6.10.2).

### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#3734](https://github.com/py-pdf/pypdf/pull/3734).

PYSEC-2026-3011 — pypdf: Manipulated FlateDecode predictor parameters can exhaust RAM

2026-09-29T00:46:56.530910+00:00

Affected: PyPI: pypdf

### Patches This has been fixed in [pypdf==6.10.2](https://github.com/py-pdf/pypdf/releases/tag/6.10.2).

### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#3734](https://github.com/py-pdf/pypdf/pull/3734).