Use After Free in Python

CVE-2023-33595

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

Vulnerability class: Use-After-Free

EPSS: 0.004 (29.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

Affected products

  • Python — versions 3.12.0
  • N/a — versions n/a

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2023-33595?
CVE-2023-33595 is a medium-severity vulnerability in Python, classified under Use After Free. CVSS score: 5.5/10. Published 2023-06-07.
How severe is CVE-2023-33595?
Medium severity. CVSS v3 base score is 5.5 out of 10.
Is CVE-2023-33595 known to be exploited?
1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.