VDB
CVE-2026-17084
CVE-2026-17084
PUBLISHED
CVSS 6 MEDIUM
Reported by PSF · Published August 18, 2026
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.
Risk Scores
CVSS 4.0
6
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
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Python Software Foundation | CPython | 0 |
| chainguard | python-3.12 | 0, 0, 0 |
| chainguard | python-3.13 | 0, 0, 0 |
| chainguard | python-3.14 | 0, 0, 0 |
| wolfi | python-3.10 | 0, 0, 0 |
| wolfi | python-3.13 | 0, 0, 0 |
| chainguard | python-3.11 | 0, 0, 0 |
| chainguard | python-3.10 | 0, 0, 0 |
| Python Software Foundation | CPython | 0, 0, 0 |
| wolfi | python-3.11 | 0, 0, 0 |
| wolfi | python-3.14 | 0, 0, 0 |
| wolfi | python-3.12 | 0, 0, 0 |
Timeline
- Aug 18, 2026 CVE Published
- Aug 22, 2026 Coalition ESS Score
- Aug 24, 2026 EPSS Score
- Aug 26, 2026 EPSS Score
- Aug 30, 2026 EPSS Score
- Sep 3, 2026 EPSS Score
- Sep 5, 2026 EPSS Score
- Sep 5, 2026 Security Advisory
- Sep 6, 2026 EPSS Score
- Sep 9, 2026 EPSS Score
- Sep 10, 2026 EPSS Score
- Sep 10, 2026 CVE Updated
References
- patch
- issue-tracking
- vendor-advisory
- patch
- patch
- patch
- patch
- patch
- patch
- http://www.openwall.com/lists/oss-security/2026/08/18/2 url