CVE-2026-42266

HIGH

8.8

CVSS v3

Description

JupyterLab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. From 4.0.0 to 4.5.6, the allow-list of extensions that can be installed from PyPI Extension Manager (allowed_extensions_uris) is not correctly enforced by JupyterLab. The PyPI Extension Manager was not contained to packages listed on the default PyPI index. This vulnerability is fixed in 4.5.7.

CWE-88 CWE-602

How to fix

Remediation Available

jupyterlabDebian

Fixed in:4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-3CVE-2026-42266

registry.redhat.io/mta/mtaRed Hat / RHEL

Fixed in:hub-rhel9@sha256:0223927b9e584f302aabafdbf015a779b14c9b5816cf0baa0cb1bfe0b1cc3415_arm64RHSA-2026:43038

Fixed in:cli-rhel9@sha256:d466bf042711b13fc53cbc561b70e4f58cd77f8a05d1d4ee10c10a6e1c201fe7_amd64RHSA-2026:43038

Fixed in:rhel9-operator@sha256:957a553608cbf9ed108c22f851ef809ed348cf592610851c3a554f3342ba511a_arm64RHSA-2026:43038

Fixed in:ui-rhel9@sha256:a77f5a731c20943958b5f654bf3147b690d5dd608b794bff261a23dd89f785f1_amd64RHSA-2026:43038

Fixed in:cli-rhel9@sha256:ecae0c1053637d609a19773757c0ea8b336b645950a42473015daabfe9677fab_arm64RHSA-2026:43038

Fixed in:ui-rhel9@sha256:f59dcacb1eed9bcd539bc6c26a630115cf35378d77075247fb42219836e2adb7_arm64RHSA-2026:43038

Fixed in:operator-bundle@sha256:94f88bf557a036c54b348c2689c699a720d5d347b1bba141feec273e624ccdbf_amd64RHSA-2026:43038

Fixed in:hub-rhel9@sha256:2e251b0343327f2ac6e60d2888da526be6a82a355310f1aea93011426cddc485_amd64RHSA-2026:43038

registry.redhat.io/mta/mtaRocky

Fixed in:cli-rhel9@sha256:d466bf042711b13fc53cbc561b70e4f58cd77f8a05d1d4ee10c10a6e1c201fe7_amd64RHSA-2026:43038

Fixed in:ui-rhel9@sha256:a77f5a731c20943958b5f654bf3147b690d5dd608b794bff261a23dd89f785f1_amd64RHSA-2026:43038

Fixed in:cli-rhel9@sha256:ecae0c1053637d609a19773757c0ea8b336b645950a42473015daabfe9677fab_arm64RHSA-2026:43038

Fixed in:operator-bundle@sha256:94f88bf557a036c54b348c2689c699a720d5d347b1bba141feec273e624ccdbf_amd64RHSA-2026:43038

Fixed in:rhel9-operator@sha256:957a553608cbf9ed108c22f851ef809ed348cf592610851c3a554f3342ba511a_arm64RHSA-2026:43038

Fixed in:hub-rhel9@sha256:0223927b9e584f302aabafdbf015a779b14c9b5816cf0baa0cb1bfe0b1cc3415_arm64RHSA-2026:43038

Fixed in:hub-rhel9@sha256:2e251b0343327f2ac6e60d2888da526be6a82a355310f1aea93011426cddc485_amd64RHSA-2026:43038

Fixed in:rhel9-operator@sha256:3926f791376886972749cae0f8eb635af67a088811214066c6deb010c6b762f0_amd64RHSA-2026:43038

registry.redhat.io/mta/mta-analyzerRed Hat / RHEL

Fixed in:addon-rhel9@sha256:1e20ac649ee7fdcdad9930b1f0384e10c8794db9a2f211d4e3d1679c0c10cc53_amd64RHSA-2026:43038

Fixed in:addon-rhel9@sha256:907c0c8c40c1fb494caa5feac439b90754160bf3f79d8e76cf2dded63f549db6_arm64RHSA-2026:43038

registry.redhat.io/mta/mta-analyzerRocky

Fixed in:addon-rhel9@sha256:907c0c8c40c1fb494caa5feac439b90754160bf3f79d8e76cf2dded63f549db6_arm64RHSA-2026:43038

Fixed in:addon-rhel9@sha256:1e20ac649ee7fdcdad9930b1f0384e10c8794db9a2f211d4e3d1679c0c10cc53_amd64RHSA-2026:43038

registry.redhat.io/mta/mta-discoveryRocky

Fixed in:addon-rhel9@sha256:a72cbf7b2ba6420e31ecca15f7d3628a671dd642a6ccf4610c5a26462a5d4b36_amd64RHSA-2026:43038

Fixed in:addon-rhel9@sha256:7377a2c2f16ca436819cbbf106fc27d3a8c44c7fca0a44108ccc826bf8678ace_arm64RHSA-2026:43038

registry.redhat.io/mta/mta-discoveryRed Hat / RHEL

Fixed in:addon-rhel9@sha256:a72cbf7b2ba6420e31ecca15f7d3628a671dd642a6ccf4610c5a26462a5d4b36_amd64RHSA-2026:43038

Fixed in:addon-rhel9@sha256:7377a2c2f16ca436819cbbf106fc27d3a8c44c7fca0a44108ccc826bf8678ace_arm64RHSA-2026:43038

registry.redhat.io/mta/mta-dotnet-externalRocky

Fixed in:provider-rhel9@sha256:794180378ddb9a88001d76b849df305034924683a79ef145f744fe03bee9c32b_amd64RHSA-2026:43038

Fixed in:provider-rhel9@sha256:b5d66f8d4c6d6680886e631296c927c9502817fbb823a680f1dabf1cc92e0465_arm64RHSA-2026:43038

registry.redhat.io/mta/mta-dotnet-externalRed Hat / RHEL

Fixed in:provider-rhel9@sha256:794180378ddb9a88001d76b849df305034924683a79ef145f744fe03bee9c32b_amd64RHSA-2026:43038

Fixed in:provider-rhel9@sha256:b5d66f8d4c6d6680886e631296c927c9502817fbb823a680f1dabf1cc92e0465_arm64RHSA-2026:43038

registry.redhat.io/mta/mta-go-externalRocky

Fixed in:provider-rhel9@sha256:8e5ba3659ef5f88b81c1c9d795b6af6048fd7d870493ce5f013efcb9fce90b9d_amd64RHSA-2026:43038

Fixed in:provider-rhel9@sha256:8f91d460985e1a97ac6892d26c0517f39871d94d1b3bfad005d58d424bed2b0b_arm64RHSA-2026:43038

registry.redhat.io/mta/mta-go-externalRed Hat / RHEL

Fixed in:provider-rhel9@sha256:8f91d460985e1a97ac6892d26c0517f39871d94d1b3bfad005d58d424bed2b0b_arm64RHSA-2026:43038

Fixed in:provider-rhel9@sha256:8e5ba3659ef5f88b81c1c9d795b6af6048fd7d870493ce5f013efcb9fce90b9d_amd64RHSA-2026:43038

registry.redhat.io/mta/mta-java-externalRocky

Fixed in:provider-rhel9@sha256:e8bd699e851fbab4466d1d25e3a08e2bcf8997978cb7f19f509c627be42d03dd_amd64RHSA-2026:43038

Fixed in:provider-rhel9@sha256:60c4a45085db3517f6a9bae32a4b93fd2dfa799c3e957776ad2d8ab0777507c2_arm64RHSA-2026:43038

registry.redhat.io/mta/mta-java-externalRed Hat / RHEL

Fixed in:provider-rhel9@sha256:e8bd699e851fbab4466d1d25e3a08e2bcf8997978cb7f19f509c627be42d03dd_amd64RHSA-2026:43038

Fixed in:provider-rhel9@sha256:60c4a45085db3517f6a9bae32a4b93fd2dfa799c3e957776ad2d8ab0777507c2_arm64RHSA-2026:43038

registry.redhat.io/mta/mta-nodejs-externalRocky

Fixed in:provider-rhel9@sha256:a89c4d19ff39a406f3279b4ffd6f8d2a2a82a78ab3e9aa1dc0f2c385a24fa844_arm64RHSA-2026:43038

Fixed in:provider-rhel9@sha256:12883516af95bf0f6abad1556d22896f16a087c1e4191fedc1f5d689cf6d67f6_amd64RHSA-2026:43038

registry.redhat.io/mta/mta-nodejs-externalRed Hat / RHEL

Fixed in:provider-rhel9@sha256:12883516af95bf0f6abad1556d22896f16a087c1e4191fedc1f5d689cf6d67f6_amd64RHSA-2026:43038

Fixed in:provider-rhel9@sha256:a89c4d19ff39a406f3279b4ffd6f8d2a2a82a78ab3e9aa1dc0f2c385a24fa844_arm64RHSA-2026:43038

registry.redhat.io/mta/mta-platformRed Hat / RHEL

Fixed in:addon-rhel9@sha256:f421044ff3d6911097aebcbabfac87ddad74987e0e5f18a96dd89454f46a4cdf_amd64RHSA-2026:43038

Fixed in:addon-rhel9@sha256:647ca556be4338749fbe7cb18580466ce6155bfce17c96deda7b7c037fd16240_arm64RHSA-2026:43038

registry.redhat.io/mta/mta-platformRocky

Fixed in:addon-rhel9@sha256:647ca556be4338749fbe7cb18580466ce6155bfce17c96deda7b7c037fd16240_arm64RHSA-2026:43038

Fixed in:addon-rhel9@sha256:f421044ff3d6911097aebcbabfac87ddad74987e0e5f18a96dd89454f46a4cdf_amd64RHSA-2026:43038

registry.redhat.io/mta/mta-python-externalRocky

Fixed in:provider-rhel9@sha256:25618ee8a690f336e1604a1b1ca9dd5197bbdea5cd02cfaf588fbd950a8fd228_arm64RHSA-2026:43038

Fixed in:provider-rhel9@sha256:4f46867f5ff78e9e970bc572a1a625080ae8faea29dc098d3d7d4355e8350ca1_amd64RHSA-2026:43038

registry.redhat.io/mta/mta-python-externalRed Hat / RHEL

Fixed in:provider-rhel9@sha256:4f46867f5ff78e9e970bc572a1a625080ae8faea29dc098d3d7d4355e8350ca1_amd64RHSA-2026:43038

Fixed in:provider-rhel9@sha256:25618ee8a690f336e1604a1b1ca9dd5197bbdea5cd02cfaf588fbd950a8fd228_arm64RHSA-2026:43038

registry.redhat.io/mta/mta-solutionRed Hat / RHEL

Fixed in:server-rhel9@sha256:21fab4b77580795980fd60b24ab1d6a3cc159a9246beccd1c19938bca94edd23_amd64RHSA-2026:43038

Fixed in:server-rhel9@sha256:f8c8651cc5fa016003ef4105f28775e0b225472d2c3135e5f37d1e1f748c515e_arm64RHSA-2026:43038

registry.redhat.io/mta/mta-solutionRocky

Fixed in:server-rhel9@sha256:21fab4b77580795980fd60b24ab1d6a3cc159a9246beccd1c19938bca94edd23_amd64RHSA-2026:43038

Fixed in:server-rhel9@sha256:f8c8651cc5fa016003ef4105f28775e0b225472d2c3135e5f37d1e1f748c515e_arm64RHSA-2026:43038

registry.redhat.io/rhoai/odhRocky

Fixed in:rhel9-operator@sha256:219d87a1f6d09f4d82e5c09d4dbd6e254229b986ccf8da9317fc5e948163b565_amd64RHSA-2026:60520

Fixed in:cli-rhel9@sha256:db345b46ed71b50223ee62c58a1a70198e2d728fca81550a81a932d5d7e718f6_amd64RHSA-2026:60520

Fixed in:mlserver-rhel9@sha256:6e90d968eefeee69280e9a5d8cbfa48ad4077a6b96abc98b59a2a84990cffaec_arm64RHSA-2026:60520

Fixed in:rhel9-operator@sha256:a4b2199382587329e39636bf07fa74c3659c0b3b4cb2dd9f1ec68306fbc2a438_s390xRHSA-2026:60520

Fixed in:operator-bundle@sha256:a4a6034012ae72d42cdd8c9258caa15c41511b1ef6fb3f2268a5634761d71a6e_amd64RHSA-2026:60520

Fixed in:autorag-rhel9@sha256:719e138a13ad9cfaff20cb03295538c85dda4fc051ff866b25e04f1be8456ea4_s390xRHSA-2026:60520

Fixed in:trainer-rhel9@sha256:1a360f65e4232a7ca1b8e20b798ac44b7fde684d45252c60d4f801cb0e596ef5_arm64RHSA-2026:60520

Fixed in:dashboard-rhel9@sha256:c7daef8e89de0e096983b72e81eeae966cea075874f1ddc498e0f92b9d5a278d_arm64RHSA-2026:60520

registry.redhat.io/rhoai/odhRed Hat / RHEL

Fixed in:rhel9-operator@sha256:3b8f50c575b12c8ce89d42bb72085e153aa564c28786dcdfaa5c89d6afe6d30c_ppc64leRHSA-2026:60520

Fixed in:mlserver-rhel9@sha256:6e90d968eefeee69280e9a5d8cbfa48ad4077a6b96abc98b59a2a84990cffaec_arm64RHSA-2026:60520

Fixed in:automl-rhel9@sha256:81087b35bd99aff8fc8db0918bc613b96e4d9a3eafff3a27078185c06412b6d1_arm64RHSA-2026:60520

Fixed in:mlflow-rhel9@sha256:2feba54cbd221a4786bcab320c8438816b0632df71f82f23b123ed4a4a111210_ppc64leRHSA-2026:60520

Fixed in:trainer-rhel9@sha256:1a360f65e4232a7ca1b8e20b798ac44b7fde684d45252c60d4f801cb0e596ef5_arm64RHSA-2026:60520

Fixed in:trainer-rhel9@sha256:017d26624a3a3f0572d15d88967a47cb92f7e192ad9b57732499c71db3f273ec_ppc64leRHSA-2026:60520

Fixed in:autorag-rhel9@sha256:8404758b6b7609b6728f3d464560221bb0250e82406ec879cfcb50819e19f201_arm64RHSA-2026:60520

Fixed in:mlflow-rhel9@sha256:4cf62283b344149cbdaab95c7045df607d101745ff0657146de50087fbb2bfb5_amd64RHSA-2026:60520

registry.redhat.io/rhoai/odh-ai-gateway-payloadRocky

Fixed in:processing-rhel9@sha256:170e78670297c1c9435cff22c3f227edd58dc30993ebd0cb3d8265de838210af_arm64RHSA-2026:60520

Fixed in:processing-rhel9@sha256:2f83d14f149aa832849e346b90fb4449ba3511bb56108cfeebe295b627c1cb80_amd64RHSA-2026:60520

Fixed in:processing-rhel9@sha256:617d5a2b3008ad195f6f26692ff9a8ee6ebb2a940b39b7245916af517b130a90_s390xRHSA-2026:60520

Fixed in:processing-rhel9@sha256:5cb9fb802c5439bd68d14df430144da061675fdd70f1b38a07284e0e5c8b3894_ppc64leRHSA-2026:60520

registry.redhat.io/rhoai/odh-ai-gateway-payloadRed Hat / RHEL

Fixed in:processing-rhel9@sha256:5cb9fb802c5439bd68d14df430144da061675fdd70f1b38a07284e0e5c8b3894_ppc64leRHSA-2026:60520

Fixed in:processing-rhel9@sha256:2f83d14f149aa832849e346b90fb4449ba3511bb56108cfeebe295b627c1cb80_amd64RHSA-2026:60520

Fixed in:processing-rhel9@sha256:617d5a2b3008ad195f6f26692ff9a8ee6ebb2a940b39b7245916af517b130a90_s390xRHSA-2026:60520

Fixed in:processing-rhel9@sha256:170e78670297c1c9435cff22c3f227edd58dc30993ebd0cb3d8265de838210af_arm64RHSA-2026:60520

registry.redhat.io/rhoai/odh-built-inRocky

Fixed in:detector-rhel9@sha256:bddfb02d685a2511cbf83bf8c6fba7872864b411adcb06d272bbfda89882883a_s390xRHSA-2026:60520

Fixed in:detector-rhel9@sha256:e7d23a7fa4026469af734196cc0f56d5fdadd79eb5d04bb77c152019356ab679_arm64RHSA-2026:60520

Fixed in:detector-rhel9@sha256:3037ef27d81723dbe3ca98bf55c5c93fff42f3fad5935559cbf6eb272778ed7f_ppc64leRHSA-2026:60520

Fixed in:detector-rhel9@sha256:b017469cbd901503271b8944df40a74cf408c5223a880c696448f2b098b7c112_amd64RHSA-2026:60520

registry.redhat.io/rhoai/odh-built-inRed Hat / RHEL

Fixed in:detector-rhel9@sha256:bddfb02d685a2511cbf83bf8c6fba7872864b411adcb06d272bbfda89882883a_s390xRHSA-2026:60520

Fixed in:detector-rhel9@sha256:3037ef27d81723dbe3ca98bf55c5c93fff42f3fad5935559cbf6eb272778ed7f_ppc64leRHSA-2026:60520

Fixed in:detector-rhel9@sha256:e7d23a7fa4026469af734196cc0f56d5fdadd79eb5d04bb77c152019356ab679_arm64RHSA-2026:60520

Fixed in:detector-rhel9@sha256:b017469cbd901503271b8944df40a74cf408c5223a880c696448f2b098b7c112_amd64RHSA-2026:60520

registry.redhat.io/rhoai/odh-data-science-pipelines-argoRocky

Fixed in:workflowcontroller-rhel9@sha256:c9ccf4e8a33568b7dcc701f59d51b913607424bf95e8b51709911cf3e690db51_arm64RHSA-2026:60520

Fixed in:argoexec-rhel9@sha256:775c307e1cfb3f68cfc081aafc9d968ace5ff88b5407e4365bb46d9ab7fcf609_amd64RHSA-2026:60520

Fixed in:workflowcontroller-rhel9@sha256:6838e7e122464c2a2afbc1ec7294c6bea54a59110cfcd090e17e462aa99050e7_amd64RHSA-2026:60520

Fixed in:argoexec-rhel9@sha256:5b32f727afed4fe60f0c1f53d05bc0345e2b02c55c9882de10cb376366686461_arm64RHSA-2026:60520

Fixed in:workflowcontroller-rhel9@sha256:c8bcf379905652e7822492d03f18cbac2e92421055a6f760b8a3ec1ec712b6a1_ppc64leRHSA-2026:60520

Fixed in:argoexec-rhel9@sha256:9fa5ec6f9e81cb122f732887a065272bcd98448180923be0024c541bee75b7e1_ppc64leRHSA-2026:60520

registry.redhat.io/rhoai/odh-data-science-pipelines-argoRed Hat / RHEL

Fixed in:workflowcontroller-rhel9@sha256:c8bcf379905652e7822492d03f18cbac2e92421055a6f760b8a3ec1ec712b6a1_ppc64leRHSA-2026:60520

Fixed in:workflowcontroller-rhel9@sha256:6838e7e122464c2a2afbc1ec7294c6bea54a59110cfcd090e17e462aa99050e7_amd64RHSA-2026:60520

Fixed in:argoexec-rhel9@sha256:9fa5ec6f9e81cb122f732887a065272bcd98448180923be0024c541bee75b7e1_ppc64leRHSA-2026:60520

Fixed in:argoexec-rhel9@sha256:775c307e1cfb3f68cfc081aafc9d968ace5ff88b5407e4365bb46d9ab7fcf609_amd64RHSA-2026:60520

Fixed in:argoexec-rhel9@sha256:5b32f727afed4fe60f0c1f53d05bc0345e2b02c55c9882de10cb376366686461_arm64RHSA-2026:60520

Fixed in:workflowcontroller-rhel9@sha256:c9ccf4e8a33568b7dcc701f59d51b913607424bf95e8b51709911cf3e690db51_arm64RHSA-2026:60520

registry.redhat.io/rhoai/odh-data-science-pipelines-operatorRed Hat / RHEL

Fixed in:controller-rhel9@sha256:201cc48366e9650b4524b83352e72289bf62235a7ab9aa2903eb4ebee2ae83ee_arm64RHSA-2026:60520

Fixed in:controller-rhel9@sha256:5fa73ac9806750dba8388a9b3087f44d3cc82f015e620defd84f2adfe0301d50_ppc64leRHSA-2026:60520

Fixed in:controller-rhel9@sha256:ff7949a0e9c7e53332ef5b66d56b195b5857cb565cf7c77db7e371dc583b4f74_amd64RHSA-2026:60520

This vulnerability affects an unusually large number of packages. The highest-confidence fixes are shown above; the full list is longer. Check the referenced advisories for complete coverage.

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

0.63%probability of exploitation in 30 days

47thpercentile

Moderate risk: more likely to be exploited than 47% of all known CVEs.

References

Patch1

github.com

Vendor Advisory1

github.com

Product2

Other references5

Related Vulnerabilities

Other CWE-88 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2016-10033	Critical	9.8	100%	KEV	Fix
CVE-2022-36804	High	8.8	99%	KEV	Fix
CVE-2026-24061	Critical	9.8	98%	KEV	Fix
CVE-2007-0882	High	10.0	98%	-	-
CVE-2018-19518	High	7.5	95%	-	Fix
CVE-2018-17456	Critical	9.8	93%	-	Fix

Common questions

How do I fix CVE-2026-42266?

Published advisories record a fix for 193 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2026-42266 being actively exploited?

Not that we know of. CVE-2026-42266 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.63% is the estimated probability that it will be exploited in the next 30 days. That is higher than 47% of all scored CVEs.

How severe is CVE-2026-42266?

CVE-2026-42266 has a CVSS v3 base score of 8.8, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-42266 affect?

Published advisories record a fix for jupyterlab (Debian), registry.redhat.io/mta/mta (Red Hat / RHEL), registry.redhat.io/mta/mta (Rocky), registry.redhat.io/mta/mta-analyzer (Red Hat / RHEL), and 189 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

Embed a live status badge for CVE-2026-42266

Markdown

[![CVE-2026-42266](https://tridentstack.com/cve/badge/CVE-2026-42266.svg)](https://tridentstack.com/cve/CVE-2026-42266)

HTML

<a href="https://tridentstack.com/cve/CVE-2026-42266"><img src="https://tridentstack.com/cve/badge/CVE-2026-42266.svg" alt="CVE-2026-42266"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

See how it works Start freeThis CVE lookup is free and always will be.

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-08-28.