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.
Analysis and contextual insights are available on OpenCVE Cloud.
No vendor fix or workaround currently provided.
Additional remediation guidance may be available on OpenCVE Cloud.
Tracking
Sign in to view the affected projects.
No advisories yet.
Tue, 18 Aug 2026 19:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Weaknesses | CWE-20 |
Tue, 18 Aug 2026 18:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
Tue, 18 Aug 2026 18:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| References |
|
Tue, 18 Aug 2026 17:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| References |
|
Tue, 18 Aug 2026 16:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Python
Python cpython |
|
| Vendors & Products |
Python
Python cpython |
Tue, 18 Aug 2026 16:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Weaknesses | CWE-436 |
Tue, 18 Aug 2026 16:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Weaknesses | CWE-20 |
Tue, 18 Aug 2026 14:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Title | stringprep.map_table_b2() deviates from RFC 3454 Table B.2 — breaks IDNA interoperability | stringprep.map_table_b2() deviates from RFC 3454 Table B.2 |
Tue, 18 Aug 2026 14:00:00 +0000
| Type | Values Removed | Values 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. | |
| Title | stringprep.map_table_b2() deviates from RFC 3454 Table B.2 — breaks IDNA interoperability | |
| References |
| |
| Metrics |
cvssV4_0
|
Status: PUBLISHED
Assigner: PSF
Published:
Updated: 2026-08-18T18:02:43.165Z
Reserved: 2026-07-24T14:36:15.943Z
Link: CVE-2026-17084
Updated: 2026-08-18T17:08:22.725Z
Status : Awaiting Analysis
Published: 2026-08-18T14:16:56.290
Modified: 2026-08-18T18:17:26.490
Link: CVE-2026-17084
No data.
OpenCVE Enrichment
Updated: 2026-08-18T21:00:04Z