Not a U.S. government website. NDD is an independent vulnerability database by Volerion and is not affiliated with or endorsed by NIST or NVD.

CVE-2023-36464 Details

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.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:5.5 MEDIUMVector:CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CNA: [email protected]CVSS-B:6.2 MEDIUMVector:CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.

URL	Source(s)	Tag(s)
https://github.com/py-pdf/pypdf/pull/1828	CVE	Patch
https://github.com/py-pdf/pypdf/pull/969	CVE	Issue TrackingPatch
https://github.com/py-pdf/pypdf/security/advisories/GHSA-4vvm-4w3v-6mr8	CVE	ExploitPatch
https://github.com/py-pdf/pypdf/pull/1828	[email protected]	Patch
https://github.com/py-pdf/pypdf/pull/969	[email protected]	Issue TrackingPatch
https://github.com/py-pdf/pypdf/security/advisories/GHSA-4vvm-4w3v-6mr8	[email protected]	ExploitPatch

see all 6 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-835	Loop with Unreachable Exit Condition ('Infinite Loop')	[email protected]

Affected Products

Product	Versions
pypdf project pypdf	< 3.9.0
CPE cpe:2.3:a:pypdf_project:pypdf:::::::: Remediation No remediation found in references.
pypdf2 project pypdf2	>= 2.2.0
CPE cpe:2.3:a:pypdf2_project:pypdf2:::::::: Remediation No remediation found in references.

Change History

5 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Jun 17, 2026	CVE Modified	CISA-ADP
Nov 21, 2024	CVE Modified	CVE
May 14, 2024	CVE Modified	[email protected]
Jul 6, 2023	Initial Analysis	[email protected]