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Vulnerability record · CVE-2023-33595 · published 7 June 2023

CVE-2023-33595: Python use after free vulnerability

Python · Python

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

5.5 CVSS 3.1 Medium EPSS 0.37% · top 68.6% CWE-416 · Use after free
5.5CVSS 3.1 base score
0.37%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

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

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/python/cpython/issues/103824 Issue TrackingVendor Advisory
https://github.com/python/cpython/pull/103993/commits/c120bc2d354ca3d27d0c7a53bf65574ddaabaf3a Patch
https://github.com/python/cpython/issues/103824 Issue TrackingVendor Advisory
https://github.com/python/cpython/pull/103993/commits/c120bc2d354ca3d27d0c7a53bf65574ddaabaf3a Patch

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Source: NIST National Vulnerability Database (record CVE-2023-33595), CISA KEV, FIRST EPSS (scores of 2026-11-14). This page is refreshed as NVD updates the record.