# CVE-2026-45409: python3-idna: Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, excepti... CVE-2026-45409 is fixed in 15 products on 1 platform, first by python3-idna 3.3-1ubuntu0.2, released June 5, 2026. It is not reported as exploited. Patch Radar priority: Routine. - Web page: https://patchblox.com/security/cve/CVE-2026-45409 - Priority: Routine - CVSS: 5.3 (Moderate) - EPSS: 0.0041 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Jun 5, 2026 ## Description Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems. Security Fix(es): * python-idna: idna: Denial of Service via specially crafted long inputs (CVE-2026-45409) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | mingw-python-idna Fedora 43 | 3.18-1.fc43 | [FEDORA-2026-9DBF4D0CA8](https://patchblox.com/security/data/fix/linux/fedora-2026-9dbf4d0ca8.md) | Jul 12, 2026 | | Linux | mingw32-python3-idna Fedora 43 | 3.18-1.fc43 | [FEDORA-2026-9DBF4D0CA8](https://patchblox.com/security/data/fix/linux/fedora-2026-9dbf4d0ca8.md) | Jul 12, 2026 | | Linux | mingw64-python3-idna Fedora 43 | 3.18-1.fc43 | [FEDORA-2026-9DBF4D0CA8](https://patchblox.com/security/data/fix/linux/fedora-2026-9dbf4d0ca8.md) | Jul 12, 2026 | | Linux | python-idna Debian 13.5 (trixie) | 3.10-1+deb13u1 | [DEBIAN-CVE-2026-45409](https://patchblox.com/security/data/fix/linux/debian-cve-2026-45409.md) | Jun 27, 2026 | | Linux | python-idna Debian 14 | 3.11-1.1 | [DEBIAN-CVE-2026-45409](https://patchblox.com/security/data/fix/linux/debian-cve-2026-45409.md) | Jun 27, 2026 | | Linux | python-idna Fedora 43 | 3.18-1.fc43 | [FEDORA-2026-6215E65F6C](https://patchblox.com/security/data/fix/linux/fedora-2026-6215e65f6c.md) | Jul 10, 2026 | | Linux | python-idna RHEL 10 | 3.7-6.el10_2 | [RHSA-2026:54481](https://patchblox.com/security/data/fix/linux/rhsa-2026-54481.md) | Jun 5, 2026 | | Linux | python-idna opensuse-leap 16.0 | 3.10-160000.3.1 | [OPENSUSE-SU-2026:21048-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21048-1.md) | Jun 24, 2026 | | Linux | python-idna rocky 10 | 0:3.7-6.el10_2 | [RLSA-2026:54481](https://patchblox.com/security/data/fix/linux/rlsa-2026-54481.md) | Aug 13, 2026 | | Linux | python-idna rocky 8 | 0:2.5-8.el8_10 | [RLSA-2026:54290](https://patchblox.com/security/data/fix/linux/rlsa-2026-54290.md) | Aug 13, 2026 | | Linux | python-idna rocky 9 | 0:2.10-8.el9_8 | [RLSA-2026:54484](https://patchblox.com/security/data/fix/linux/rlsa-2026-54484.md) | Aug 13, 2026 | | Linux | python-idna sles 15.7 | 2.6-150000.3.9.1 | [SUSE-SU-2026:3100-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3100-1.md) | Jul 17, 2026 | | Linux | python-idna sles 16.0 | 3.10-160000.3.1 | [SUSE-SU-2026:22356-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22356-1.md) | Jun 24, 2026 | | Linux | python3-idna Fedora 43 | 3.18-1.fc43 | [FEDORA-2026-6215E65F6C](https://patchblox.com/security/data/fix/linux/fedora-2026-6215e65f6c.md) | Jul 10, 2026 | | Linux | python3-idna RHEL 8 | 0:2.5-8.el8_10 | [RHSA-2026:54290](https://patchblox.com/security/data/fix/linux/rhsa-2026-54290.md) | Aug 13, 2026 | | Linux | python3-idna RHEL 9 | 0:2.10-8.el9_8 | [RHSA-2026:54484](https://patchblox.com/security/data/fix/linux/rhsa-2026-54484.md) | Aug 14, 2026 | | Linux | python3-idna Ubuntu 22.04.1 LTS (jammy) | 3.3-1ubuntu0.2 | [python3-idna 3.3-1ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-python3-idna-3.3-1ubuntu0.2.md) | Jun 5, 2026 | | Linux | python3-idna Ubuntu 24.04.5 LTS (noble) | 3.6-2ubuntu0.2 | [python3-idna 3.6-2ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-python3-idna-3.6-2ubuntu0.2.md) | Jun 5, 2026 | | Linux | python3-idna Ubuntu 26.04.1 LTS (resolute) | 3.11-1ubuntu0.1 | [python3-idna 3.11-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-python3-idna-3.11-1ubuntu0.1.md) | Jun 5, 2026 | | Linux | python3-idna almalinux 10 | 3.7-6.el10_2 | [ALSA-2026:54481](https://patchblox.com/security/data/fix/linux/alsa-2026-54481.md) | Aug 13, 2026 | | Linux | python3-idna almalinux 8 | 2.5-8.el8_10 | [ALSA-2026:54290](https://patchblox.com/security/data/fix/linux/alsa-2026-54290.md) | Aug 12, 2026 | | Linux | python3-idna almalinux 9 | 2.10-8.el9_8 | [ALSA-2026:54484](https://patchblox.com/security/data/fix/linux/alsa-2026-54484.md) | Aug 13, 2026 | | Linux | python3-idna amzn 2023 | 2.10-3.amzn2023.0.4 | [ALAS2023-2026-2052](https://patchblox.com/security/data/fix/linux/alas2023-2026-2052.md) | Aug 17, 2026 | | Linux | python3-idna ol 10 | 0:3.7-6.el10_2 | [ELSA-2026-54481](https://patchblox.com/security/data/fix/linux/elsa-2026-54481.md) | Aug 13, 2026 | | Linux | python3-idna ol 8 | 0:2.5-8.el8_10 | [ELSA-2026-54290](https://patchblox.com/security/data/fix/linux/elsa-2026-54290.md) | Aug 12, 2026 | | Linux | python3-idna ol 9 | 0:2.10-8.el9_8 | [ELSA-2026-54484](https://patchblox.com/security/data/fix/linux/elsa-2026-54484.md) | Aug 13, 2026 | | Linux | python3-pip amzn 2023 | 21.3.1-2.amzn2023.0.21 | [ALAS2023-2026-2092](https://patchblox.com/security/data/fix/linux/alas2023-2026-2092.md) | Aug 31, 2026 | | Linux | python3-pip-wheel amzn 2023 | 21.3.1-2.amzn2023.0.21 | [ALAS2023-2026-2092](https://patchblox.com/security/data/fix/linux/alas2023-2026-2092.md) | Aug 31, 2026 | | Linux | python3.11-pip amzn 2023 | 22.3.1-2.amzn2023.0.14 | [ALAS2023-2026-2090](https://patchblox.com/security/data/fix/linux/alas2023-2026-2090.md) | Aug 31, 2026 | | Linux | python3.11-pip-wheel amzn 2023 | 22.3.1-2.amzn2023.0.14 | [ALAS2023-2026-2090](https://patchblox.com/security/data/fix/linux/alas2023-2026-2090.md) | Aug 31, 2026 | | Linux | python3.12-pip amzn 2023 | 23.2.1-4.amzn2023.0.11 | [ALAS2023-2026-2091](https://patchblox.com/security/data/fix/linux/alas2023-2026-2091.md) | Aug 31, 2026 | | Linux | python3.12-pip-wheel amzn 2023 | 23.2.1-4.amzn2023.0.11 | [ALAS2023-2026-2091](https://patchblox.com/security/data/fix/linux/alas2023-2026-2091.md) | Aug 31, 2026 | | Linux | python3.13-pip amzn 2023 | 24.2-259.amzn2023.0.8 | [ALAS2023-2026-2089](https://patchblox.com/security/data/fix/linux/alas2023-2026-2089.md) | Aug 31, 2026 | | Linux | python3.13-pip-wheel amzn 2023 | 24.2-259.amzn2023.0.8 | [ALAS2023-2026-2089](https://patchblox.com/security/data/fix/linux/alas2023-2026-2089.md) | Aug 31, 2026 | | Linux | python3.14-pip amzn 2023 | 26.1.1-1.amzn2023.0.3 | [ALAS2023-2026-2093](https://patchblox.com/security/data/fix/linux/alas2023-2026-2093.md) | Aug 31, 2026 | | Linux | python3.14-pip-wheel amzn 2023 | 26.1.1-1.amzn2023.0.3 | [ALAS2023-2026-2093](https://patchblox.com/security/data/fix/linux/alas2023-2026-2093.md) | Aug 31, 2026 | --- Data as of 2026-11-08T00:53:09Z UTC. 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