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OpenAdvisories
Medium · 6.9 CVE-2026-45409 EUVD-2026-34921GHSA-65pc-fj4g-8rjxPYSEC-2026-215

Internationalized Domain Names in Applications (IDNA): Specially crafted inputs to idna.encode() can bypass CVE-2024-3651 fix

Published Jun 5, 2026 · Updated Jun 8, 2026 · Assigned by GitHub_M

Vendor: kjd Product: idna Package: airflow-3 Package: confluent-docker-utils Package: dask-kubernetes Package: datadog-agent-7.72 Package: datadog-agent-7.72-core-integrations Package: datadog-agent-7.73 Package: datadog-agent-7.73-core-integrations Package: datadog-agent-7.77 Package: datadog-agent-7.77-core-integrations Package: datadog-agent-7.78 Package: datadog-agent-7.78-core-integrations Package: datadog-agent-7.79 Package: datadog-agent-7.79-core-integrations Package: datadog-agent-7.80-core-integrations Package: datadog-agent-7.81-core-integrations Package: ggshield Package: httpie Package: idna Package: jupyter-base-notebook Package: jwt-tool Package: katib-earlystopping Package: katib-suggestion-goptuna-compat Package: katib-suggestion-hyperband Package: katib-suggestion-hyperopt Package: katib-suggestion-nas-darts Package: katib-suggestion-optuna-enas Package: katib-suggestion-pbt-enas Package: katib-suggestion-skopt-enas Package: kserve-storage-controller Package: kubeflow-jupyter-web-app Package: kubeflow-pipelines-apiserver Package: kubeflow-pipelines-visualization-server Package: kubeflow-volumes-web-app Package: open-webui Package: py3-cassandra-medusa Package: py3.10-pip-base Package: py3.10-pipenv Package: py3.11-pip-base Package: py3.11-pipenv Package: py3.12-pip-base Package: py3.12-pipenv Package: py3.13-pip-base Package: py3.13-pipenv Package: py3.14-pip-base Package: pypy-3.10 Package: pypy-3.11 Package: python-idna Package: python-idna Package: python-pip Package: reflex Package: semgrep Package: superset-6.0 Ecosystem: Debian Ecosystem: PyPI Ecosystem: Ubuntu Ecosystem: Wolfi

Description

Internationalized Domain Names in Applications (IDNA) for Python provides support for Internationalized Domain Names in Applications (IDNA) and Unicode IDNA Compatibility Processing. In versions prior to 3.15, payloads such as `"\u0660" * N` or `"\u30fb" * N + "\u6f22"` utilize the `valid_contexto` function prior to length rejection, and for high values of `N` will take a long time to process. This is the same issue as CVE-2024-3651, however the original remediation in 2024 was not a complete fix. A specially crafted argument to the `idna.encode()` function could consume significant resources. This may lead to a denial-of-service. Starting in version 3.14, the function rejects long inputs as soon as practicable prior to any further processing to minimize resource consumption. In version 3.15, this approach was extended to lesser used alternate functions (i.e. per-label conversions and codec support). A workaround is available. Domain names cannot exceed 253 characters in length. If this length limit is enforced prior to passing the domain to the `idna.encode()` function, it should no longer consume significant resources. This is triggered by arbitrarily large inputs that would not occur in normal usage, but may be passed to the library assuming there is no preliminary input validation by the higher-level application.

Affected products

VendorProductAffectedFixed
kjd idna < 3.15 —

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

Debian

Security tracker ↗
ReleasePackageFixed inAdvisory
Debian 14 python-idna 3.11-1.1 —
Debian 13 python-idna 3.10-1+deb13u1 —
Debian 12 python-idna No fix yet —

Ubuntu

Security tracker ↗
ReleasePackageFixed inAdvisory
Ubuntu 26.10 python-pip No fix yet —
Ubuntu 26.04 LTS python-idna 3.11-1ubuntu0.1 USN-8549-1
Ubuntu 25.10 python-pip +1 No fix yet —
Ubuntu 24.04 LTS python-idna 3.6-2ubuntu0.2 USN-8549-1
Ubuntu 22.04 LTS python-idna 3.3-1ubuntu0.2 USN-8549-1
Show 8 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu 20.04 LTS python-idna No fix yet —
Ubuntu Pro 26.04 LTS python-pip No fix yet —
Ubuntu Pro 24.04 LTS python-pip No fix yet —
Ubuntu Pro 22.04 LTS python-pip No fix yet —
Ubuntu Pro 20.04 LTS python-pip No fix yet —
Ubuntu Pro 18.04 LTS python-pip +1 No fix yet —
Ubuntu Pro 16.04 LTS python-pip +1 No fix yet —
Ubuntu Pro 14.04 LTS python-pip No fix yet —

Red Hat

Security tracker ↗
ReleasePackageFixed inAdvisory
RHEL 10 python-idna +1 3.7-6.el10_2 RHSA-2026:54481
RHEL 9 python-idna +1 2.10-8.el9_8 RHSA-2026:54484
RHEL 8 python-idna +1 2.5-8.el8_10 RHSA-2026:54290
Show 1 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Red Hat Hardened Images 1 jaeger 2.19.0-1.hum1 RHSA-2026:25039
Red Hat Hardened Images 1 python-idna +1 3.18-1.hum1 RHSA-2026:25503
Red Hat Hardened Images 1 python-rpds-py +1 2026.6.3-1.hum1 RHSA-2026:34119

AlmaLinux

Errata ↗
ReleasePackageFixed inAdvisory
AlmaLinux 10 python3-idna 3.7-6.el10_2 ALSA-2026:54481
AlmaLinux 9 python3-idna 2.10-8.el9_8 ALSA-2026:54484
AlmaLinux 8 python3-idna 2.5-8.el8_10 ALSA-2026:54290

Rocky Linux

Errata ↗
ReleasePackageFixed inAdvisory
Rocky Linux 10 python-idna 3.7-6.el10_2 RLSA-2026:54481
Rocky Linux 9 python-idna 2.10-8.el9_8 RLSA-2026:54484
Rocky Linux 8 python-idna 2.5-8.el8_10 RLSA-2026:54290

SUSE

Security tracker ↗
ReleasePackageFixed inAdvisory
SLES 15 SP7 python-idna 2.6-150000.3.9.1 SUSE-SU-2026:3100-1
SLES 15 SP4 python-idna 3.4-150400.11.13.1 SUSE-SU-2026:2828-1
SLES 12 SP5 python-idna 2.5-3.16.1 SUSE-SU-2026:3101-1
SLES 12 python-idna 2.5-3.16.1 SUSE-SU-2026:3101-1
SLES 3 python-idna 3.4-150400.11.13.1 SUSE-SU-2026:2828-1
Show 17 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
SLES for SAP 16.0 python-idna 3.10-160000.3.1 SUSE-SU-2026:22356-1
SLES 16.0 python-idna 3.10-160000.3.1 SUSE-SU-2026:22356-1
SLE Micro 6.2 python-idna 3.10-160000.3.1 SUSE-SU-2026:22271-1
SLE Micro 5.5 python-idna 2.6-150000.3.9.1 SUSE-SU-2026:3100-1
SLE Micro 5.4 python-idna 2.6-150000.3.9.1 SUSE-SU-2026:3100-1
SLE Micro 5.3 python-idna 2.6-150000.3.9.1 SUSE-SU-2026:3100-1
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SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-cryptography 3.3.2-80002.3.6.5 SUSE-SU-2026:4581-1
SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-cssselect 1.3.0-80002.3.6.5 SUSE-SU-2026:4581-1
SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-editables 0.5-80002.3.3.5 SUSE-SU-2026:4581-1
SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-exceptiongroup +1 1.2.2-80002.3.3.5 SUSE-SU-2026:4581-1
SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-flit-core 3.12.0-80002.3.3.4 SUSE-SU-2026:4581-1
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SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-hatchling 1.31.0-80002.3.3.3 SUSE-SU-2026:4581-1
SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-idna 3.10-80002.3.6.5 SUSE-SU-2026:4581-1
SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-iniconfig 2.1.0-80002.3.3.3 SUSE-SU-2026:4581-1
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SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-jinja2 3.1.6-80002.5.3.5 SUSE-SU-2026:4581-1
SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-lxml 6.1.1-80002.3.9.5 SUSE-SU-2026:4581-1
SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-packaging 24.2-80002.3.3.3 SUSE-SU-2026:4581-1
SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-pip 25.0.1-80002.3.3.3 SUSE-SU-2026:4581-1
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SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-pyasn1-modules 0.4.2-80002.3.6.3 SUSE-SU-2026:4581-1
SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-pyopenssl 23.2.0-80002.3.9.3 SUSE-SU-2026:4581-1
SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-pyparsing 3.0.9-80002.3.6.3 SUSE-SU-2026:4581-1
SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-requests 2.34.2-80002.4.6.3 SUSE-SU-2026:4581-1
SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-tornado 6.3.2-80002.4.12.3 SUSE-SU-2026:4581-1
SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-urllib3 2.0.7-80002.3.6.3 SUSE-SU-2026:4581-1
SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-websocket-client 1.9.0-80002.3.6.3 SUSE-SU-2026:4581-1
SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update scap-security-guide 0.1.80-80002.3.12.4 SUSE-SU-2026:4581-1
SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update spacecmd 5.2.10-80002.3.15.3 SUSE-SU-2026:4581-1
SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update uyuni-tools 5.2.17-80002.3.15.3 SUSE-SU-2026:4581-1
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SUSE RES-7:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-cffi 1.17.1-70002.3.6.2 SUSE-SU-2026:4583-1
SUSE RES-7:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-cryptography 3.3.2-70002.3.6.2 SUSE-SU-2026:4583-1
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SUSE RES-7:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-pip 25.0.1-70002.3.3.1 SUSE-SU-2026:4583-1
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SUSE RES-7:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-websocket-client 1.9.0-70002.3.6.1 SUSE-SU-2026:4583-1
SUSE RES-7:Update:Products:MultiLinuxManagerTools:Update spacecmd 5.2.10-70002.3.15.1 SUSE-SU-2026:4583-1
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SUSE EL-10:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-pyopenssl 23.2.0-100002.1.9.1 SUSE-SU-2026:4580-1
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SUSE EL-10:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-tornado 6.3.2-100002.1.9.1 SUSE-SU-2026:4580-1
SUSE EL-10:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-urllib3 2.0.7-100002.1.9.1 SUSE-SU-2026:4580-1
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SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-cryptography 3.3.2-90002.3.6.2 SUSE-SU-2026:4582-1
SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-cssselect 1.3.0-90002.3.6.2 SUSE-SU-2026:4582-1
SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-editables 0.5-90002.3.3.2 SUSE-SU-2026:4582-1
SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-exceptiongroup +1 1.2.2-90002.3.3.2 SUSE-SU-2026:4582-1
SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-flit-core 3.12.0-90002.3.3.1 SUSE-SU-2026:4582-1
SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-hatch-fancy-pypi-readme +1 25.1.0-90002.3.3.1 SUSE-SU-2026:4582-1
SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-hatch-vcs +1 0.5.0-90002.3.3.1 SUSE-SU-2026:4582-1
SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-hatchling 1.31.0-90002.3.3.1 SUSE-SU-2026:4582-1
SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-idna 3.10-90002.3.6.2 SUSE-SU-2026:4582-1
SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-iniconfig 2.1.0-90002.3.3.1 SUSE-SU-2026:4582-1
SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-iniconfig-test 2.1.0-90002.3.3.2 SUSE-SU-2026:4582-1
SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-jinja2 3.1.6-90002.5.3.2 SUSE-SU-2026:4582-1
SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-lxml 6.1.1-90002.3.9.2 SUSE-SU-2026:4582-1
SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-packaging 24.2-90002.3.3.1 SUSE-SU-2026:4582-1
SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-pip 25.0.1-90002.3.3.1 SUSE-SU-2026:4582-1
SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-pyasn1 0.6.3-90002.3.6.1 SUSE-SU-2026:4582-1
SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-pyasn1-modules 0.4.2-90002.3.6.1 SUSE-SU-2026:4582-1
SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-pyopenssl 23.2.0-90002.3.9.1 SUSE-SU-2026:4582-1
SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-pyparsing 3.0.9-90002.3.6.1 SUSE-SU-2026:4582-1
SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-requests 2.34.2-90002.4.6.1 SUSE-SU-2026:4582-1
SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-tornado 6.3.2-90002.4.12.1 SUSE-SU-2026:4582-1
SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-urllib3 2.0.7-90002.3.6.1 SUSE-SU-2026:4582-1
SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-websocket-client 1.9.0-90002.3.6.1 SUSE-SU-2026:4582-1
SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update scap-security-guide 0.1.80-90002.3.12.1 SUSE-SU-2026:4582-1
SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update spacecmd 5.2.10-90002.3.15.1 SUSE-SU-2026:4582-1
SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update uyuni-tools 5.2.17-90002.3.15.1 SUSE-SU-2026:4582-1
SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update venv-salt-minion 3006.0-90002.5.22.1 SUSE-SU-2026:4582-1

openSUSE

Security tracker ↗
ReleasePackageFixed inAdvisory
openSUSE Tumbleweed python-idna 3.15-1.1 openSUSE-SU-2026:10829-1
openSUSE Leap 16.0 python-idna 3.10-160000.3.1 openSUSE-SU-2026:21048-1

Amazon Linux

ReleasePackageFixed inAdvisory
Amazon Linux 2023 python3-idna 2.10-3.amzn2023.0.4 ALAS2023-2026-2052
Amazon Linux 2023 python3-pip +1 21.3.1-2.amzn2023.0.21 ALAS2023-2026-2092
Amazon Linux 2023 python3.11-pip +1 22.3.1-2.amzn2023.0.14 ALAS2023-2026-2090
Amazon Linux 2023 python3.12-pip +1 23.2.1-4.amzn2023.0.11 ALAS2023-2026-2091
Amazon Linux 2023 python3.13-pip +1 24.2-259.amzn2023.0.8 ALAS2023-2026-2089
Amazon Linux 2023 python3.14-pip +1 26.1.1-1.amzn2023.0.3 ALAS2023-2026-2093

Oracle Linux

ReleasePackageFixed inAdvisory
Oracle Linux 10 python3-idna 3.7-6.el10_2 ELSA-2026-54481
Oracle Linux 9 python3-idna 2.10-8.el9_8 ELSA-2026-54484
Oracle Linux 8 python3-idna 2.5-8.el8_10 ELSA-2026-54290

Wolfi

ReleasePackageFixed inAdvisory
Wolfi rolling airflow-3 3.2.1-r4 —
Wolfi rolling confluent-docker-utils 0.0.172-r0 —
Wolfi rolling dask-kubernetes 2026.3.0-r5 —
Wolfi rolling datadog-agent-7.72 7.72.4-r24 —
Wolfi rolling datadog-agent-7.72-core-integrations 7.72.4-r27 —
Wolfi rolling datadog-agent-7.73 +1 7.73.3-r20 —
Wolfi rolling datadog-agent-7.77 7.77.3-r15 —
Wolfi rolling datadog-agent-7.77-core-integrations 7.77.3-r13 —
Wolfi rolling datadog-agent-7.78 7.78.4-r10 —
Wolfi rolling datadog-agent-7.78-core-integrations 7.78.4-r7 —
Wolfi rolling datadog-agent-7.79 +1 7.79.2-r2 —
Wolfi rolling datadog-agent-7.80-core-integrations +1 No fix yet —
Wolfi rolling ggshield 1.49.0-r2 —
Wolfi rolling httpie 3.2.4-r10 —
Wolfi rolling jupyter-base-notebook 7.5.6-r1 —
Wolfi rolling jwt-tool 2.3.0-r6 —
Wolfi rolling katib-earlystopping +6 0.19.0-r21 —
Wolfi rolling katib-suggestion-goptuna-compat 0.19.0-r40 —
Wolfi rolling kserve-storage-controller 0.18.0-r4 —
Wolfi rolling kubeflow-jupyter-web-app 1.10.0-r19 —
Wolfi rolling kubeflow-pipelines-apiserver +1 2.16.1-r3 —
Wolfi rolling kubeflow-volumes-web-app 1.10.0-r18 —
Wolfi rolling open-webui 0.9.5-r1 —
Wolfi rolling py3-cassandra-medusa 0.28.0-r1 —
Wolfi rolling py3.10-pip-base +4 26.1.2-r1 —
Wolfi rolling py3.10-pipenv +3 2026.6.2-r3 —
Wolfi rolling pypy-3.10 7.3.19-r20 —
Wolfi rolling pypy-3.11 7.3.23-r4 —
Wolfi rolling reflex 0.9.3-r0 —
Wolfi rolling semgrep 1.164.0-r0 —
Wolfi rolling superset-6.0 6.0.0-r12 —

Affected packages

EcosystemPackageAffectedFixedRecord
PyPI idna < 3.15 3.15 GHSA-65pc-fj4g-8rjx

Advisories 38

References