CVE-2023-36464
pypdf and PyPDF2 possible Infinite Loop when a comment isn't followed by a character
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"")`.
How to fix CVE-2023-36464
To remediate CVE-2023-36464, upgrade the affected package to a fixed version below.
- —upgrade to 3.4.1-1+deb12u1 or later
- —upgrade to 2.12.1-3+deb12u1 or later
- —upgrade to 3.9.0 or later
- —no fix listed
Is CVE-2023-36464 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (4)
- from 0, < 3.4.1-1+deb12u1
- from 0, < 2.12.1-3+deb12u1
- >= 3.1.0, < 3.9.0
- >= 2.2.0, <= 3.0.1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM6.2 | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |