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Vulnerabilities CVE-2026-17084

CVE-2026-17084

Medium
Open
TLP:CLEAR

stringprep.map_table_b2() deviates from RFC 3454 Table B.2 — breaks IDNA interoperability

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Description

The "stringprep" module didn't process characters from RFC 3454 tables B.2 or B.3 correctly: the latest Unicode codepoint attributes were used instead of the specified Unicode 3.2.0. This behavior would cause mismatches when processing domain names using IDNA 2003 (the "idna" codec) and the in_table_b2() function of the "stringprep" module. This only affects domain names containing characters that were not previously registered or had their Unicode attributes such as case-folding behavior updated since Unicode 3.2.0.

Details

CVSS Score
6.0
CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Confidence
90%
Published
Aug 18, 2026
Last Modified
Aug 18, 2026
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