CVE-2023-36632

Description

The legacy email.utils.parseaddr function in Python through 3.11.4 allows attackers to trigger "RecursionError: maximum recursion depth exceeded while calling a Python object" via a crafted argument. This argument is plausibly an untrusted value from an application's input data that was supposed to contain a name and an e-mail address. NOTE: email.utils.parseaddr is categorized as a Legacy API in the documentation of the Python email package. Applications should instead use the email.parser.BytesParser or email.parser.Parser class. NOTE: the vendor's perspective is that this is neither a vulnerability nor a bug. The email package is intended to have size limits and to throw an exception when limits are exceeded; they were exceeded by the example demonstration code.

How to fix CVE-2023-36632

To remediate CVE-2023-36632, upgrade the affected package to a fixed version below.

• —upgrade to 3.11.5 or later
• —upgrade to 3.11.5 or later
• —upgrade to 3.11.5 or later

Is CVE-2023-36632 being exploited?

Low — EPSS is 0.3%, meaning exploitation activity has not been observed at scale.

Affected packages (3)

• from 0, < 3.11.5
• from 0, < 3.11.5
• from 0, < 3.11.5

CVSS scores

References (5)

• WEBdocs.python.org/3/library/email.html
• WEBdocs.python.org/3/library/email.utils.html
• WEBgithub.com/Daybreak2019/PoC_python3.9_Vul/blob/main/RecursionError-email.utils.parseaddr.py
• WEBgithub.com/python/cpython/issues/103800