CVE-2023-36464

MediumCVSS 5.5/10Last modified Nov 2, 2026

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"")`.

Metrics

CVSS 3.1 5.5/10CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-835

Affected software

Vendor	Product	Versions
py-pdf	pypdf	pypdf: < 3.90; PyPDF2: >= 2.2.0

References

https://github.com/py-pdf/pypdf/pull/1828Patch
https://github.com/py-pdf/pypdf/pull/969Issue Tracking, Patch
https://github.com/py-pdf/pypdf/security/advisories/GHSA-4vvm-4w3v-6mr8Exploit, Patch
https://github.com/py-pdf/pypdf/pull/1828Patch
https://github.com/py-pdf/pypdf/pull/969Issue Tracking, Patch
https://github.com/py-pdf/pypdf/security/advisories/GHSA-4vvm-4w3v-6mr8Exploit, Patch

Timeline

Published: Jun 27, 2023
Last modified: Nov 2, 2026
NVD status: Modified

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