Vulnerability 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.
Related Weaknesses (CWE)
References
- https://github.com/python/cpython/commit/1e54caa096678a38afcabecabb1ff72400dd6ba
- https://github.com/python/cpython/commit/5181304bcec9cfc3c15311741c9154cdff2e3fd
- https://github.com/python/cpython/commit/7e109d084d55e7eb25837a5f3b47ef9beee547b
- https://github.com/python/cpython/commit/c016c2535b74227fddf2cf7334dbfead6c93021
- https://github.com/python/cpython/commit/c28b121a4f0b975937c8b5a1b4934bb361d8429
- https://github.com/python/cpython/commit/c42790b34f634051750e5da340d17c7da19e478
- https://github.com/python/cpython/issues/155292
- https://github.com/python/cpython/pull/155293
- https://mail.python.org/archives/list/[email protected]/thread/EUHHTC
- http://www.openwall.com/lists/oss-security/2026/08/18/2
FAQ
What is CVE-2026-17084?
CVE-2026-17084 is a documented vulnerability. 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 w...
How severe is CVE-2026-17084?
CVSS scoring is not yet available for CVE-2026-17084. Check NVD for updates.
Is there a patch for CVE-2026-17084?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.