{"id":"BIT-libpython-2023-36632","details":"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.","aliases":["BIT-python-2023-36632","BIT-python-min-2023-36632","CVE-2023-36632","PSF-2023-4"],"modified":"2025-08-11T15:13:42.330294Z","published":"2025-08-11T13:52:24.684Z","database_specific":{"cpes":["cpe:2.3:a:python:python:*:*:*:*:*:*:*:*"],"severity":"High"},"references":[{"type":"WEB","url":"https://docs.python.org/3/library/email.html"},{"type":"WEB","url":"https://docs.python.org/3/library/email.utils.html"},{"type":"WEB","url":"https://github.com/Daybreak2019/PoC_python3.9_Vul/blob/main/RecursionError-email.utils.parseaddr.py"},{"type":"WEB","url":"https://github.com/python/cpython/issues/103800"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-36632"}],"affected":[{"package":{"name":"libpython","ecosystem":"Bitnami","purl":"pkg:bitnami/libpython"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.11.5"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/libpython/BIT-libpython-2023-36632.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}],"schema_version":"1.7.3"}