# 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. - Web page: https://patchblox.com/security/cve/CVE-2026-17084 - Priority: Routine - CVSS: 6.0 (Moderate) - EPSS: 0.0073 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Aug 18, 2026 - Weakness: Interpretation Conflict - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-17084 ## 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. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Windows apps | Python 3.13 | 3.13.16 | [Python 3.13 3.13.16](https://patchblox.com/security/data/fix/windows-app/python.python.3.13-3.13.16.md) | Sep 30, 2026 | | Windows apps | Python 3.14 | 3.14.8 | [Python 3.14 3.14.8](https://patchblox.com/security/data/fix/windows-app/python.python.3.14-3.14.8.md) | Sep 30, 2026 | | Linux | pypy3 Debian 14 | 8.0.1+dfsg-1 | [DEBIAN-CVE-2026-17084](https://patchblox.com/security/data/fix/linux/debian-cve-2026-17084.md) | Sep 12, 2026 | | Linux | python sles 15.7 | 2.7.18-150000.133.1 | [SUSE-SU-2026:4411-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4411-1.md) | Oct 1, 2026 | | Linux | python-base sles 15.7 | 2.7.18-150000.133.1 | [SUSE-SU-2026:4411-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4411-1.md) | Oct 1, 2026 | | Linux | python3 sles 15.6 | 3.6.15-150300.10.129.1 | [SUSE-SU-2026:4754-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4754-1.md) | Nov 7, 2026 | | Linux | python3 sles 15.7 | 3.6.15-150300.10.129.1 | [SUSE-SU-2026:4754-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4754-1.md) | Nov 7, 2026 | | Linux | python3-core sles 15.6 | 3.6.15-150300.10.129.1 | [SUSE-SU-2026:4754-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4754-1.md) | Nov 7, 2026 | | Linux | python3-core sles 15.7 | 3.6.15-150300.10.129.1 | [SUSE-SU-2026:4754-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4754-1.md) | Nov 7, 2026 | | Linux | python3.11 Debian 12.15 (bookworm) | 3.11.2-6+deb12u9 | [DEBIAN-CVE-2026-17084](https://patchblox.com/security/data/fix/linux/debian-cve-2026-17084.md) | Sep 12, 2026 | | Linux | python3.11 amzn 2023 | 3.11.17-1.amzn2023.0.1 | [ALAS2023-2026-3231](https://patchblox.com/security/data/fix/linux/alas2023-2026-3231.md) | Nov 7, 2026 | | Linux | python3.11-debug amzn 2023 | 3.11.17-1.amzn2023.0.1 | [ALAS2023-2026-3231](https://patchblox.com/security/data/fix/linux/alas2023-2026-3231.md) | Nov 7, 2026 | | Linux | python3.11-debuginfo amzn 2023 | 3.11.17-1.amzn2023.0.1 | [ALAS2023-2026-3231](https://patchblox.com/security/data/fix/linux/alas2023-2026-3231.md) | Nov 7, 2026 | | Linux | python3.11-debugsource amzn 2023 | 3.11.17-1.amzn2023.0.1 | [ALAS2023-2026-3231](https://patchblox.com/security/data/fix/linux/alas2023-2026-3231.md) | Nov 7, 2026 | | Linux | python3.11-devel amzn 2023 | 3.11.17-1.amzn2023.0.1 | [ALAS2023-2026-3231](https://patchblox.com/security/data/fix/linux/alas2023-2026-3231.md) | Nov 7, 2026 | | Linux | python3.11-idle amzn 2023 | 3.11.17-1.amzn2023.0.1 | [ALAS2023-2026-3231](https://patchblox.com/security/data/fix/linux/alas2023-2026-3231.md) | Nov 7, 2026 | | Linux | python3.11-libs amzn 2023 | 3.11.17-1.amzn2023.0.1 | [ALAS2023-2026-3231](https://patchblox.com/security/data/fix/linux/alas2023-2026-3231.md) | Nov 7, 2026 | | Linux | python3.11-test amzn 2023 | 3.11.17-1.amzn2023.0.1 | [ALAS2023-2026-3231](https://patchblox.com/security/data/fix/linux/alas2023-2026-3231.md) | Nov 7, 2026 | | Linux | python3.11-tkinter amzn 2023 | 3.11.17-1.amzn2023.0.1 | [ALAS2023-2026-3231](https://patchblox.com/security/data/fix/linux/alas2023-2026-3231.md) | Nov 7, 2026 | | Linux | python3.12 amzn 2023 | 3.12.15-2.amzn2023.0.1 | [ALAS2023-2026-3230](https://patchblox.com/security/data/fix/linux/alas2023-2026-3230.md) | Nov 7, 2026 | | Linux | python3.12-debug amzn 2023 | 3.12.15-2.amzn2023.0.1 | [ALAS2023-2026-3230](https://patchblox.com/security/data/fix/linux/alas2023-2026-3230.md) | Nov 7, 2026 | | Linux | python3.12-debuginfo amzn 2023 | 3.12.15-2.amzn2023.0.1 | [ALAS2023-2026-3230](https://patchblox.com/security/data/fix/linux/alas2023-2026-3230.md) | Nov 7, 2026 | | Linux | python3.12-debugsource amzn 2023 | 3.12.15-2.amzn2023.0.1 | [ALAS2023-2026-3230](https://patchblox.com/security/data/fix/linux/alas2023-2026-3230.md) | Nov 7, 2026 | | Linux | python3.12-devel amzn 2023 | 3.12.15-2.amzn2023.0.1 | [ALAS2023-2026-3230](https://patchblox.com/security/data/fix/linux/alas2023-2026-3230.md) | Nov 7, 2026 | | Linux | python3.12-idle amzn 2023 | 3.12.15-2.amzn2023.0.1 | [ALAS2023-2026-3230](https://patchblox.com/security/data/fix/linux/alas2023-2026-3230.md) | Nov 7, 2026 | | Linux | python3.12-libs amzn 2023 | 3.12.15-2.amzn2023.0.1 | [ALAS2023-2026-3230](https://patchblox.com/security/data/fix/linux/alas2023-2026-3230.md) | Nov 7, 2026 | | Linux | python3.12-test amzn 2023 | 3.12.15-2.amzn2023.0.1 | [ALAS2023-2026-3230](https://patchblox.com/security/data/fix/linux/alas2023-2026-3230.md) | Nov 7, 2026 | | Linux | python3.12-tkinter amzn 2023 | 3.12.15-2.amzn2023.0.1 | [ALAS2023-2026-3230](https://patchblox.com/security/data/fix/linux/alas2023-2026-3230.md) | Nov 7, 2026 | | Linux | python3.13 amzn 2023 | 3.13.16-1.amzn2023.0.1 | [ALAS2023-2026-3229](https://patchblox.com/security/data/fix/linux/alas2023-2026-3229.md) | Nov 7, 2026 | | Linux | python3.13-debug amzn 2023 | 3.13.16-1.amzn2023.0.1 | [ALAS2023-2026-3229](https://patchblox.com/security/data/fix/linux/alas2023-2026-3229.md) | Nov 7, 2026 | | Linux | python3.13-debuginfo amzn 2023 | 3.13.16-1.amzn2023.0.1 | [ALAS2023-2026-3229](https://patchblox.com/security/data/fix/linux/alas2023-2026-3229.md) | Nov 7, 2026 | | Linux | python3.13-debugsource amzn 2023 | 3.13.16-1.amzn2023.0.1 | [ALAS2023-2026-3229](https://patchblox.com/security/data/fix/linux/alas2023-2026-3229.md) | Nov 7, 2026 | | Linux | python3.13-devel amzn 2023 | 3.13.16-1.amzn2023.0.1 | [ALAS2023-2026-3229](https://patchblox.com/security/data/fix/linux/alas2023-2026-3229.md) | Nov 7, 2026 | | Linux | python3.13-freethreading amzn 2023 | 3.13.16-1.amzn2023.0.1 | [ALAS2023-2026-3229](https://patchblox.com/security/data/fix/linux/alas2023-2026-3229.md) | Nov 7, 2026 | | Linux | python3.13-freethreading-debug amzn 2023 | 3.13.16-1.amzn2023.0.1 | [ALAS2023-2026-3229](https://patchblox.com/security/data/fix/linux/alas2023-2026-3229.md) | Nov 7, 2026 | | Linux | python3.13-idle amzn 2023 | 3.13.16-1.amzn2023.0.1 | [ALAS2023-2026-3229](https://patchblox.com/security/data/fix/linux/alas2023-2026-3229.md) | Nov 7, 2026 | | Linux | python3.13-libs amzn 2023 | 3.13.16-1.amzn2023.0.1 | [ALAS2023-2026-3229](https://patchblox.com/security/data/fix/linux/alas2023-2026-3229.md) | Nov 7, 2026 | | Linux | python3.13-test amzn 2023 | 3.13.16-1.amzn2023.0.1 | [ALAS2023-2026-3229](https://patchblox.com/security/data/fix/linux/alas2023-2026-3229.md) | Nov 7, 2026 | | Linux | python3.13-tkinter amzn 2023 | 3.13.16-1.amzn2023.0.1 | [ALAS2023-2026-3229](https://patchblox.com/security/data/fix/linux/alas2023-2026-3229.md) | Nov 7, 2026 | | Linux | python3.14 Debian 14 | 3.14.7-3 | [DEBIAN-CVE-2026-17084](https://patchblox.com/security/data/fix/linux/debian-cve-2026-17084.md) | Sep 12, 2026 | | Linux | python3.14 amzn 2023 | 3.14.8-1.amzn2023.0.1 | [ALAS2023-2026-3232](https://patchblox.com/security/data/fix/linux/alas2023-2026-3232.md) | Nov 7, 2026 | | Linux | python3.14-debug amzn 2023 | 3.14.8-1.amzn2023.0.1 | [ALAS2023-2026-3232](https://patchblox.com/security/data/fix/linux/alas2023-2026-3232.md) | Nov 7, 2026 | | Linux | python3.14-debuginfo amzn 2023 | 3.14.8-1.amzn2023.0.1 | [ALAS2023-2026-3232](https://patchblox.com/security/data/fix/linux/alas2023-2026-3232.md) | Nov 7, 2026 | | Linux | python3.14-debugsource amzn 2023 | 3.14.8-1.amzn2023.0.1 | [ALAS2023-2026-3232](https://patchblox.com/security/data/fix/linux/alas2023-2026-3232.md) | Nov 7, 2026 | | Linux | python3.14-devel amzn 2023 | 3.14.8-1.amzn2023.0.1 | [ALAS2023-2026-3232](https://patchblox.com/security/data/fix/linux/alas2023-2026-3232.md) | Nov 7, 2026 | | Linux | python3.14-freethreading amzn 2023 | 3.14.8-1.amzn2023.0.1 | [ALAS2023-2026-3232](https://patchblox.com/security/data/fix/linux/alas2023-2026-3232.md) | Nov 7, 2026 | | Linux | python3.14-freethreading-debug amzn 2023 | 3.14.8-1.amzn2023.0.1 | [ALAS2023-2026-3232](https://patchblox.com/security/data/fix/linux/alas2023-2026-3232.md) | Nov 7, 2026 | | Linux | python3.14-freethreading-devel amzn 2023 | 3.14.8-1.amzn2023.0.1 | [ALAS2023-2026-3232](https://patchblox.com/security/data/fix/linux/alas2023-2026-3232.md) | Nov 7, 2026 | | Linux | python3.14-freethreading-idle amzn 2023 | 3.14.8-1.amzn2023.0.1 | [ALAS2023-2026-3232](https://patchblox.com/security/data/fix/linux/alas2023-2026-3232.md) | Nov 7, 2026 | | Linux | python3.14-freethreading-libs amzn 2023 | 3.14.8-1.amzn2023.0.1 | [ALAS2023-2026-3232](https://patchblox.com/security/data/fix/linux/alas2023-2026-3232.md) | Nov 7, 2026 | | Linux | python3.14-freethreading-test amzn 2023 | 3.14.8-1.amzn2023.0.1 | [ALAS2023-2026-3232](https://patchblox.com/security/data/fix/linux/alas2023-2026-3232.md) | Nov 7, 2026 | | Linux | python3.14-freethreading-tkinter amzn 2023 | 3.14.8-1.amzn2023.0.1 | [ALAS2023-2026-3232](https://patchblox.com/security/data/fix/linux/alas2023-2026-3232.md) | Nov 7, 2026 | | Linux | python3.14-idle amzn 2023 | 3.14.8-1.amzn2023.0.1 | [ALAS2023-2026-3232](https://patchblox.com/security/data/fix/linux/alas2023-2026-3232.md) | Nov 7, 2026 | | Linux | python3.14-libs amzn 2023 | 3.14.8-1.amzn2023.0.1 | [ALAS2023-2026-3232](https://patchblox.com/security/data/fix/linux/alas2023-2026-3232.md) | Nov 7, 2026 | | Linux | python3.14-test amzn 2023 | 3.14.8-1.amzn2023.0.1 | [ALAS2023-2026-3232](https://patchblox.com/security/data/fix/linux/alas2023-2026-3232.md) | Nov 7, 2026 | | Linux | python3.14-tkinter amzn 2023 | 3.14.8-1.amzn2023.0.1 | [ALAS2023-2026-3232](https://patchblox.com/security/data/fix/linux/alas2023-2026-3232.md) | Nov 7, 2026 | | Linux | python3.15 Debian 14 | 3.15.0~rc2-1 | [DEBIAN-CVE-2026-17084](https://patchblox.com/security/data/fix/linux/debian-cve-2026-17084.md) | Sep 12, 2026 | | Linux | python311 sles 15.6 | 3.11.17-150600.3.74.1 | [SUSE-SU-2026:4946-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4946-1.md) | Nov 7, 2026 | | Linux | python311 sles 15.7 | 3.11.17-150600.3.74.1 | [SUSE-SU-2026:4946-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4946-1.md) | Nov 7, 2026 | | Linux | python311-core sles 15.6 | 3.11.17-150600.3.74.1 | [SUSE-SU-2026:4946-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4946-1.md) | Nov 7, 2026 | | Linux | python311-core sles 15.7 | 3.11.17-150600.3.74.1 | [SUSE-SU-2026:4946-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4946-1.md) | Nov 7, 2026 | | Linux | python312 sles 15.6 | 3.12.14-150600.3.68.1 | [SUSE-SU-2026:4534-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4534-1.md) | Oct 6, 2026 | | Linux | python312-core sles 15.6 | 3.12.14-150600.3.68.1 | [SUSE-SU-2026:4534-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4534-1.md) | Oct 6, 2026 | | Linux | python313 sles 15.7 | 3.13.16-150700.4.61.1 | [SUSE-SU-2026:4941-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4941-1.md) | Nov 7, 2026 | | Linux | python313-core sles 15.7 | 3.13.16-150700.4.61.1 | [SUSE-SU-2026:4941-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4941-1.md) | Nov 7, 2026 | ## No fix yet | Platform | Product | Status | |---|---|---| | Windows apps | Python 2 | no-fix | | Windows apps | Python 3.10 | no-fix | | Windows apps | Python 3.11 | no-fix | | Windows apps | Python 3.12 | no-fix | | Windows apps | Python 3.5 | no-fix | | Windows apps | Python 3.6 | no-fix | | Windows apps | Python 3.7 | no-fix | | Windows apps | Python 3.8 | no-fix | | Windows apps | Python 3.9 | no-fix | | macOS | Python3 | no-fix | --- Data as of 2026-11-09T07:25:28Z UTC. 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