{"cve":"CVE-2026-17084","nvd":{"published":"2026-08-18T14:16:56.290","modified":"2026-10-22T22:10:00.250","status":"Awaiting Analysis","description":"The \"stringprep\" module didn't process characters from RFC 3454 tables \nB.2 or B.3 correctly: the latest Unicode codepoint attributes were used \ninstead of the specified Unicode 3.2.0. This behavior would cause \nmismatches when processing domain names using IDNA 2003 (the \"idna\" \ncodec) and the in_table_b2() function of the \"stringprep\" module. This \nonly affects domain names containing characters that were not previously\n registered or had their Unicode attributes such as case-folding \nbehavior updated since Unicode 3.2.0.","cvss_v4":{"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","score":6.0},"cvss_v3":null,"cwes":["CWE-436"],"references":["https://github.com/python/cpython/commit/1e54caa096678a38afcabecabb1ff72400dd6bae","https://github.com/python/cpython/commit/5181304bcec9cfc3c15311741c9154cdff2e3fd7","https://github.com/python/cpython/commit/69f92ebaec681e9149dfd70fd02d4ed52d2a6296","https://github.com/python/cpython/commit/7e109d084d55e7eb25837a5f3b47ef9beee547bc","https://github.com/python/cpython/commit/c016c2535b74227fddf2cf7334dbfead6c930214"],"products":[],"source":"nvd","synced_at":"2026-10-23T16:39:26.291718493+00:00"},"epss":{"cve":"CVE-2026-17084","score":0.00734,"percentile":0.5412,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}