Main Vulnerability Database Vulnerabilities #VU110143

Use-after-free in Python - CVE-2023-33595

Published: December 8, 2023 / Updated: June 3, 2025

Vulnerability identifier: #VU110143

CSH Severity: Medium

CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

CVE-ID: CVE-2023-33595

CWE-ID: CWE-416

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerable software:
Python

Software vendor:
Python.org

Description

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

CPython v3.12.0 alpha 7 was discovered to contain a heap use-after-free via the function ascii_decode at /Objects/unicodeobject.c.

Install update from vendor's website.