Infinite Loop when a comment isn't followed by a character in pypdf

Vulnerability Description

pypdf is an open source, pure-python PDF library. In affected versions an attacker may craft a PDF which leads to an infinite loop if `__parse_content_stream` is executed. That is, for example, the case if the user extracted text from such a PDF. This issue was introduced in pull request #969 and resolved in pull request #1828. Users are advised to upgrade. Users unable to upgrade may modify the line `while peek not in (b"\r", b"\n")` in `pypdf/generic/_data_structures.py` to `while peek not in (b"\r", b"\n", b"")`.

References

• https://github.com/py-pdf/pypdf/security/advisories/GHSA-4vvm-4w3v-6mr8
• https://github.com/py-pdf/pypdf/pull/1828
• https://github.com/py-pdf/pypdf/pull/969