Dashboard / CVE-2023-36807

CVE-2023-36807

MEDIUM
MEDIUM Priority: 0.04 BB Relevance: 63/100
Published: 2023-06-30 Modified: 2026-11-02 First seen: 2026-11-02 Status: active

Attack Surface

Network Low Complexity No Auth

CVSS Vector Breakdown

AV: Network
AC: Low
PR: None
UI: Required
S: Unchanged
C: None
I: None
A: High

Description

pypdf is a pure-python PDF library capable of splitting, merging, cropping, and transforming the pages of PDF files. In version 2.10.5 an attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This infinite loop blocks the current process and can utilize a single core of the CPU by 100%. It does not affect memory usage. That is, for example, the case if the user extracted metadata from such a malformed PDF. Versions prior to 2.10.5 throw an error, but do not hang forever. This issue was fixed with https://github.com/py-pdf/pypdf/pull/1331 which has been included in release 2.10.6. Users are advised to upgrade. Users unable to upgrade should modify `PyPDF2/generic/_data_structures.py::read_object` to an an error throwing case. See GHSA-hm9v-vj3r-r55m for details.

Weakness Classification (1)

Affected Software (1)

VendorProductVersion
py-pdf pypdf 2.10.5

References & Advisories (3)

https://github.com/py-pdf/pypdf/issues/1329
Exploit Issue Tracking Vendor Advisory

Bug Bounty Relevance

63 / 100
✓ Network accessible
✓ No authentication
✓ Low complexity

CVSS Score

6.5 / 10.0 v3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

EPSS — Exploitation Probability

0.57%
Raw Score 0.005730
Percentile 47.9%
Date 2026-11-13

EPSS Trend

2026-11-13
0.00573
2026-11-12
0.00573
2026-11-10
0.00573
2026-11-09
0.00573
2026-11-08
0.00573
2026-11-07
0.00573
2026-11-06
0.00573
2026-11-05
0.00573
2026-11-04
0.00573
2026-11-03
0.00573
2026-11-02
0.00573

Intelligence Sources

nvd ref →

External Links