| Package | Affected versions | Patched versions |
|---|---|---|
| pypdf | < 6.8.0 | 6.8.0 |
| pypdf | < 6.8.0 | 6.8.0 |
An attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing a content stream with a rather large /Length value, regardless of the actual data length inside the stream.
This has been fixed in pypdf==6.8.0.
If you cannot upgrade yet, consider applying the changes from PR #3675.
As far as we are aware, this mostly affects reading from buffers of unknown size, as returned by open("file.pdf", mode="rb") for example. Passing a file path or a BytesIO buffer to pypdf instead does not seem to trigger the vulnerability.
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