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"")`.
CVE-2023-36464
CVSS base score
6.2 (v3.1)
Severity
MEDIUM
Attack vector
Local
Weakness
CWE-835
Last modified
November 2, 2026
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
py-pdf pypdf
pypdf2 project pypdf2
References
- github.com Patch
- github.com Issue Tracking, Patch
- github.com Exploit, Patch
- github.com Patch
- github.com Issue Tracking, Patch
- github.com Exploit, Patch