CVE-2026-17084
stringprep.map_table_b2() deviates from RFC 3454 Table B.2
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.
INFO
Published Date :
Aug. 18, 2026, 2:16 p.m.
Last Modified :
Sept. 10, 2026, 1:16 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-17084
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 4.0 | MEDIUM | 28c92f92-d60d-412d-b760-e73465c3df22 | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Update the 'stringprep' module.
- Ensure correct Unicode codepoint attributes are used.
- Validate domain names with IDNA 2003.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-17084.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-17084 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-17084
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-17084 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-17084 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
Sep. 10, 2026
Action Type Old Value New Value Added Reference https://github.com/python/cpython/commit/c28b121a4f0b975937c8b5a1b4934bb361d84296 Added Reference https://github.com/python/cpython/commit/c42790b34f634051750e5da340d17c7da19e4784 -
CVE Modified by [email protected]
Sep. 09, 2026
Action Type Old Value New Value Added Reference https://github.com/python/cpython/commit/c016c2535b74227fddf2cf7334dbfead6c930214 -
CVE Modified by [email protected]
Sep. 05, 2026
Action Type Old Value New Value Added Reference https://github.com/python/cpython/commit/1e54caa096678a38afcabecabb1ff72400dd6bae -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Sep. 02, 2026
Action Type Old Value New Value Added Reference http://www.openwall.com/lists/oss-security/2026/08/18/2 Removed Reference http://www.openwall.com/lists/oss-security/2026/08/18/2 -
CVE Modified by [email protected]
Sep. 02, 2026
Action Type Old Value New Value Added Affected Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/17xxx/CVE-2026-17084.json">CVE-2026-17084</a> Added Reference https://github.com/python/cpython/commit/5181304bcec9cfc3c15311741c9154cdff2e3fd7 Added Reference https://github.com/python/cpython/commit/7e109d084d55e7eb25837a5f3b47ef9beee547bc Added Reference https://github.com/python/cpython/issues/155292 Added Reference https://github.com/python/cpython/pull/155293 Added Reference https://mail.python.org/archives/list/[email protected]/thread/EUHHTC6EV7HCLSUHP25C5VHSV4V2MUZN/ Removed Reference https://github.com/python/cpython/commit/5181304bcec9cfc3c15311741c9154cdff2e3fd7 Removed Reference https://github.com/python/cpython/commit/7e109d084d55e7eb25837a5f3b47ef9beee547bc Removed Reference https://github.com/python/cpython/issues/155292 Removed Reference https://github.com/python/cpython/pull/155293 Removed Reference https://mail.python.org/archives/list/[email protected]/thread/EUHHTC6EV7HCLSUHP25C5VHSV4V2MUZN/ -
CVE Modified by [email protected]
Aug. 19, 2026
Action Type Old Value New Value Added Reference https://github.com/python/cpython/commit/5181304bcec9cfc3c15311741c9154cdff2e3fd7 -
CVE Modified by [email protected]
Aug. 18, 2026
Action Type Old Value New Value Added Reference https://github.com/python/cpython/commit/7e109d084d55e7eb25837a5f3b47ef9beee547bc Changed Affected [{'repo': 'https://github.com/python/cpython', 'vendor': 'Python Software Foundation', 'modules': ['stringprep', 'idna'], 'product': 'CPython', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '3.16.0', 'versionType': 'python'}], 'defaultStatus': 'unaffected'}] [{'repo': 'https://github.com/python/cpython', 'vendor': 'Python Software Foundation', 'modules': ['stringprep', 'idna'], 'product': 'CPython', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '3.15.0', 'versionType': 'python'}], 'defaultStatus': 'unaffected'}] -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Aug. 18, 2026
Action Type Old Value New Value Added Reference http://www.openwall.com/lists/oss-security/2026/08/18/2 -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Aug. 18, 2026
Action Type Old Value New Value Added CWE CWE-436 Added SSVC {'id': 'CVE-2026-17084', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-08-18T16:03:21.438212Z'} -
CVE Modified by [email protected]
Aug. 18, 2026
Action Type Old Value New Value Changed Affected [{'repo': 'https://github.com/python/cpython', 'vendor': 'Python Software Foundation', 'product': 'CPython', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '3.16.0', 'versionType': 'python'}], 'defaultStatus': 'unaffected'}] [{'repo': 'https://github.com/python/cpython', 'vendor': 'Python Software Foundation', 'modules': ['stringprep', 'idna'], 'product': 'CPython', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '3.16.0', 'versionType': 'python'}], 'defaultStatus': 'unaffected'}] -
New CVE Received by [email protected]
Aug. 18, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://github.com/python/cpython', 'vendor': 'Python Software Foundation', 'product': 'CPython', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '3.16.0', 'versionType': 'python'}], 'defaultStatus': 'unaffected'}] Added 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. Added CVSS V4.0 AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added Reference https://github.com/python/cpython/issues/155292 Added Reference https://github.com/python/cpython/pull/155293 Added Reference https://mail.python.org/archives/list/[email protected]/thread/EUHHTC6EV7HCLSUHP25C5VHSV4V2MUZN/