Search: CVE-2026-17084

CVE-2026-17084 is a medium severity vulnerability in the Python Software Foundation's CPython implementation. The issue lies in the "stringprep" module, which incorrectly processes characters from RFC 3454 tables B.2 and B.3 by using the latest Unicode codepoint attributes instead of those from Unicode 3.2.0. This causes mismatches when handling domain names with the IDNA 2003 "idna" codec and the in_table_b2() function, particularly for domain names containing characters whose Unicode attributes have changed since Unicode 3.2.0.