CVE-2023-36464: Infinite Loop when a comment isn't followed by a character in pypdf
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"")`.
Classification
CVE ID: CVE-2023-36464
CVSS Base Severity: MEDIUM
CVSS Base Score: 6.2
Affected Products
Vendor: py-pdf
Product: pypdf
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.07% (probability of being exploited)
EPSS Percentile: 33.23% (scored less or equal to compared to others)
EPSS Date: 2025-02-03 (when was this score calculated)
References
https://github.com/py-pdf/pypdf/security/advisories/GHSA-4vvm-4w3v-6mr8https://github.com/py-pdf/pypdf/pull/1828
https://github.com/py-pdf/pypdf/pull/969