CVE-2026-17084
stringprep.map_table_b2() deviates from RFC 3454 Table B.2
CVE-2026-17084 is fixed in 59 products on 3 platforms, first by DEBIAN-CVE-2026-17084, released September 12, 2026. 10 other affected products have no fix yet. It is not reported as exploited. Patch Radar priority: Routine.
RoutineFixed on 3 platforms
CVSS
6.0
Moderate
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0073
54th percentile
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Windows apps | |||
| Python 3.13 | 3.13.16 | Python 3.13 3.13.16 | Sep 30, 2026 |
| Python 3.14 | 3.14.8 | Python 3.14 3.14.8 | Sep 30, 2026 |
| Linux | |||
| pypy3 · Debian 14 | 8.0.1+dfsg-1 | DEBIAN-CVE-2026-17084 | Sep 12, 2026 |
| python · sles 15.7 | 2.7.18-150000.133.1 | SUSE-SU-2026:4411-1 | Oct 1, 2026 |
| python-base · sles 15.7 | 2.7.18-150000.133.1 | SUSE-SU-2026:4411-1 | Oct 1, 2026 |
| python3 · sles 15.6 | 3.6.15-150300.10.129.1 | SUSE-SU-2026:4754-1 | Nov 7, 2026 |
| python3 · sles 15.7 | 3.6.15-150300.10.129.1 | SUSE-SU-2026:4754-1 | Nov 7, 2026 |
| python3-core · sles 15.6 | 3.6.15-150300.10.129.1 | SUSE-SU-2026:4754-1 | Nov 7, 2026 |
| python3-core · sles 15.7 | 3.6.15-150300.10.129.1 | SUSE-SU-2026:4754-1 | Nov 7, 2026 |
| python3.11 · Debian 12.15 (bookworm) | 3.11.2-6+deb12u9 | DEBIAN-CVE-2026-17084 | Sep 12, 2026 |
| python3.11 · amzn 2023 | 3.11.17-1.amzn2023.0.1 | ALAS2023-2026-3231 | Nov 7, 2026 |
| python3.11-debug · amzn 2023 | 3.11.17-1.amzn2023.0.1 | ALAS2023-2026-3231 | Nov 7, 2026 |
| python3.11-debuginfo · amzn 2023 | 3.11.17-1.amzn2023.0.1 | ALAS2023-2026-3231 | Nov 7, 2026 |
| python3.11-debugsource · amzn 2023 | 3.11.17-1.amzn2023.0.1 | ALAS2023-2026-3231 | Nov 7, 2026 |
| python3.11-devel · amzn 2023 | 3.11.17-1.amzn2023.0.1 | ALAS2023-2026-3231 | Nov 7, 2026 |
| python3.11-idle · amzn 2023 | 3.11.17-1.amzn2023.0.1 | ALAS2023-2026-3231 | Nov 7, 2026 |
| python3.11-libs · amzn 2023 | 3.11.17-1.amzn2023.0.1 | ALAS2023-2026-3231 | Nov 7, 2026 |
| python3.11-test · amzn 2023 | 3.11.17-1.amzn2023.0.1 | ALAS2023-2026-3231 | Nov 7, 2026 |
| python3.11-tkinter · amzn 2023 | 3.11.17-1.amzn2023.0.1 | ALAS2023-2026-3231 | Nov 7, 2026 |
| python3.12 · amzn 2023 | 3.12.15-2.amzn2023.0.1 | ALAS2023-2026-3230 | Nov 7, 2026 |
| python3.12-debug · amzn 2023 | 3.12.15-2.amzn2023.0.1 | ALAS2023-2026-3230 | Nov 7, 2026 |
| python3.12-debuginfo · amzn 2023 | 3.12.15-2.amzn2023.0.1 | ALAS2023-2026-3230 | Nov 7, 2026 |
| python3.12-debugsource · amzn 2023 | 3.12.15-2.amzn2023.0.1 | ALAS2023-2026-3230 | Nov 7, 2026 |
| python3.12-devel · amzn 2023 | 3.12.15-2.amzn2023.0.1 | ALAS2023-2026-3230 | Nov 7, 2026 |
| python3.12-idle · amzn 2023 | 3.12.15-2.amzn2023.0.1 | ALAS2023-2026-3230 | Nov 7, 2026 |
| python3.12-libs · amzn 2023 | 3.12.15-2.amzn2023.0.1 | ALAS2023-2026-3230 | Nov 7, 2026 |
| python3.12-test · amzn 2023 | 3.12.15-2.amzn2023.0.1 | ALAS2023-2026-3230 | Nov 7, 2026 |
| python3.12-tkinter · amzn 2023 | 3.12.15-2.amzn2023.0.1 | ALAS2023-2026-3230 | Nov 7, 2026 |
| python3.13 · amzn 2023 | 3.13.16-1.amzn2023.0.1 | ALAS2023-2026-3229 | Nov 7, 2026 |
| python3.13-debug · amzn 2023 | 3.13.16-1.amzn2023.0.1 | ALAS2023-2026-3229 | Nov 7, 2026 |
| python3.13-debuginfo · amzn 2023 | 3.13.16-1.amzn2023.0.1 | ALAS2023-2026-3229 | Nov 7, 2026 |
| python3.13-debugsource · amzn 2023 | 3.13.16-1.amzn2023.0.1 | ALAS2023-2026-3229 | Nov 7, 2026 |
| python3.13-devel · amzn 2023 | 3.13.16-1.amzn2023.0.1 | ALAS2023-2026-3229 | Nov 7, 2026 |
| python3.13-freethreading · amzn 2023 | 3.13.16-1.amzn2023.0.1 | ALAS2023-2026-3229 | Nov 7, 2026 |
| python3.13-freethreading-debug · amzn 2023 | 3.13.16-1.amzn2023.0.1 | ALAS2023-2026-3229 | Nov 7, 2026 |
| python3.13-idle · amzn 2023 | 3.13.16-1.amzn2023.0.1 | ALAS2023-2026-3229 | Nov 7, 2026 |
| python3.13-libs · amzn 2023 | 3.13.16-1.amzn2023.0.1 | ALAS2023-2026-3229 | Nov 7, 2026 |
| python3.13-test · amzn 2023 | 3.13.16-1.amzn2023.0.1 | ALAS2023-2026-3229 | Nov 7, 2026 |
| python3.13-tkinter · amzn 2023 | 3.13.16-1.amzn2023.0.1 | ALAS2023-2026-3229 | Nov 7, 2026 |
| python3.14 · Debian 14 | 3.14.7-3 | DEBIAN-CVE-2026-17084 | Sep 12, 2026 |
| python3.14 · amzn 2023 | 3.14.8-1.amzn2023.0.1 | ALAS2023-2026-3232 | Nov 7, 2026 |
| python3.14-debug · amzn 2023 | 3.14.8-1.amzn2023.0.1 | ALAS2023-2026-3232 | Nov 7, 2026 |
| python3.14-debuginfo · amzn 2023 | 3.14.8-1.amzn2023.0.1 | ALAS2023-2026-3232 | Nov 7, 2026 |
| python3.14-debugsource · amzn 2023 | 3.14.8-1.amzn2023.0.1 | ALAS2023-2026-3232 | Nov 7, 2026 |
| python3.14-devel · amzn 2023 | 3.14.8-1.amzn2023.0.1 | ALAS2023-2026-3232 | Nov 7, 2026 |
| python3.14-freethreading · amzn 2023 | 3.14.8-1.amzn2023.0.1 | ALAS2023-2026-3232 | Nov 7, 2026 |
| python3.14-freethreading-debug · amzn 2023 | 3.14.8-1.amzn2023.0.1 | ALAS2023-2026-3232 | Nov 7, 2026 |
| python3.14-freethreading-devel · amzn 2023 | 3.14.8-1.amzn2023.0.1 | ALAS2023-2026-3232 | Nov 7, 2026 |
| python3.14-freethreading-idle · amzn 2023 | 3.14.8-1.amzn2023.0.1 | ALAS2023-2026-3232 | Nov 7, 2026 |
| python3.14-freethreading-libs · amzn 2023 | 3.14.8-1.amzn2023.0.1 | ALAS2023-2026-3232 | Nov 7, 2026 |
| python3.14-freethreading-test · amzn 2023 | 3.14.8-1.amzn2023.0.1 | ALAS2023-2026-3232 | Nov 7, 2026 |
| python3.14-freethreading-tkinter · amzn 2023 | 3.14.8-1.amzn2023.0.1 | ALAS2023-2026-3232 | Nov 7, 2026 |
| python3.14-idle · amzn 2023 | 3.14.8-1.amzn2023.0.1 | ALAS2023-2026-3232 | Nov 7, 2026 |
| python3.14-libs · amzn 2023 | 3.14.8-1.amzn2023.0.1 | ALAS2023-2026-3232 | Nov 7, 2026 |
| python3.14-test · amzn 2023 | 3.14.8-1.amzn2023.0.1 | ALAS2023-2026-3232 | Nov 7, 2026 |
| python3.14-tkinter · amzn 2023 | 3.14.8-1.amzn2023.0.1 | ALAS2023-2026-3232 | Nov 7, 2026 |
| python3.15 · Debian 14 | 3.15.0~rc2-1 | DEBIAN-CVE-2026-17084 | Sep 12, 2026 |
| python311 · sles 15.6 | 3.11.17-150600.3.74.1 | SUSE-SU-2026:4946-1 | Nov 7, 2026 |
| python311 · sles 15.7 | 3.11.17-150600.3.74.1 | SUSE-SU-2026:4946-1 | Nov 7, 2026 |
| python311-core · sles 15.6 | 3.11.17-150600.3.74.1 | SUSE-SU-2026:4946-1 | Nov 7, 2026 |
| python311-core · sles 15.7 | 3.11.17-150600.3.74.1 | SUSE-SU-2026:4946-1 | Nov 7, 2026 |
| python312 · sles 15.6 | 3.12.14-150600.3.68.1 | SUSE-SU-2026:4534-1 | Oct 6, 2026 |
| python312-core · sles 15.6 | 3.12.14-150600.3.68.1 | SUSE-SU-2026:4534-1 | Oct 6, 2026 |
| python313 · sles 15.7 | 3.13.16-150700.4.61.1 | SUSE-SU-2026:4941-1 | Nov 7, 2026 |
| python313-core · sles 15.7 | 3.13.16-150700.4.61.1 | SUSE-SU-2026:4941-1 | Nov 7, 2026 |
| No fix yet | |||
| Python 2 (Windows apps) | No fix yet | no-fix | n/a |
| Python 3.10 (Windows apps) | No fix yet | no-fix | n/a |
| Python 3.11 (Windows apps) | No fix yet | no-fix | n/a |
| Python 3.12 (Windows apps) | No fix yet | no-fix | n/a |
| Python 3.5 (Windows apps) | No fix yet | no-fix | n/a |
| Python 3.6 (Windows apps) | No fix yet | no-fix | n/a |
| Python 3.7 (Windows apps) | No fix yet | no-fix | n/a |
| Python 3.8 (Windows apps) | No fix yet | no-fix | n/a |
| Python 3.9 (Windows apps) | No fix yet | no-fix | n/a |
| Python3 (macOS) | No fix yet | no-fix | n/a |
Patch Radar data is free to use with attribution. Terms and how to credit it.
Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.