Vulnerability in Python
CVE-2023-36632
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.016 (74.6th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 74.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- docs.python.org/3/library/email.utils.html (Product)
- docs.python.org/3/library/email.html (Product)
- github.com/Daybreak2019/PoC_python3.9_Vul/blob/main/RecursionError-email.utils… (Product)
- github.com/python/cpython/issues/103800 (Exploit, Issue Tracking)
Frequently asked questions
- What is CVE-2023-36632?
- CVE-2023-36632 is a high-severity vulnerability in Python, classified under Uncontrolled Recursion. CVSS score: 7.5/10. Published 2023-06-25.
- How severe is CVE-2023-36632?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2023-36632 known to be exploited?
- 5 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.