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CVE-2026-17084— stringprep.map_table_b2() deviates from RFC 3454 Table B.2

Quick assessment

Affected
Python Software Foundation CPython
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

“stringprep”模块未能正确处理来自 RFC 3454 表 B.2 和 B.3 的字符，而是使用了最新的 Unicode 码点属性，而非规范的 Unicode 3.2.0 版本定义。这种不一致会在处理使用 IDNA 2003（即“idna”编解码器）的域名时，导致与“stringprep”模块中的 in_table_b2() 函数产生匹配错误。该问题仅影响包含自 Unicode 3.2.0 以来新增注册或其 Unicode 属性（如大小写折叠行为）发生变更的字符的域名。

CVSS 6.0 · Medium EPSS 0.48% · P40

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Python Software Foundation CPython < 3.15.0 affected
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I. Basic Information for CVE-2026-17084

Vulnerability Information
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Vulnerability Title
stringprep.map_table_b2() deviates from RFC 3454 Table B.2
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Python Software Foundation CPython 0 ~ 3.15.0 -

II. Public POCs for CVE-2026-17084

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III. Intelligence Information for CVE-2026-17084

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Patches & Fixes for CVE-2026-17084 (3)

Vendor Advisories for CVE-2026-17084 (1)

Other References for CVE-2026-17084 (1)

IV. Related Vulnerabilities

Same product: CPython
Same vendor: Python Software Foundation

V. Comments for CVE-2026-17084

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