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OpenAdvisories
High · 8.1 CVE-2026-42211 EUVD-2026-33999GHSA-49rj-9fvp-4h2h

React Router's vendored turbo-stream v2 allows arbitrary constructor invocation via TYPE_ERROR deserialization leading to Unauth RCE

Published Jun 2, 2026 · Updated Jun 3, 2026 · Assigned by GitHub_M

Description

React Router is a router for React. In versions 7.0.0 through 7.14.1, when using Framework Mode, a combination of steps could potentially allow unauthorized remote code execution (RCE) through external requests. This attack requires the application code to have an existing prototype pollution vulnerability, which can then be leveraged in a 2-step attack where the second step triggers unauthorized RCE on the remote server. This does not impact applications using Declarative Mode (`<BrowserRouter>`) or Data Mode (`createBrowserRouter/<RouterProvider>`). This is patched in version 7.14.2.

Affected products

VendorProductAffectedFixed
remix-run react-router >= 7.0.0, < 7.14.2 —

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.

ReleasePackageFixed inAdvisory
Red Hat Hardened Images 1 opentelemetry-collector-contrib 0.155.0-0.1.hum1 RHSA-2026:29770
ReleasePackageFixed inAdvisory
SLES 15 SP7 golang-github-prometheus-prometheus 3.13.2-150100.4.40.2 SUSE-SU-2026:4606-1
Show 2 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
SUSE Multi Linux Manager Tools SLE-Micro-5 uyuni-tools 5.2.17-150002.3.20.1 SUSE-SU-2026:4585-1
SUSE Multi Linux Manager Tools SLE-Micro-5 venv-salt-minion 3006.0-150002.5.22.1 SUSE-SU-2026:4585-1
SUSE Multi Linux Manager Tools SLE-15 golang-github-prometheus-prometheus 3.13.2-150002.3.19.1 SUSE-SU-2026:4585-1
SUSE Multi Linux Manager Tools SLE-15 grafana 12.4.10-150002.4.27.1 SUSE-SU-2026:4585-1
SUSE Multi Linux Manager Tools SLE-15 mgr-push 5.2.5-150002.3.12.1 SUSE-SU-2026:4585-1
SUSE Multi Linux Manager Tools SLE-15 spacecmd 5.2.10-150002.3.15.1 SUSE-SU-2026:4585-1
SUSE Multi Linux Manager Tools SLE-15 spacewalk-client-tools 5.2.7-150002.3.12.1 SUSE-SU-2026:4585-1
SUSE Multi Linux Manager Tools SLE-15 uyuni-tools 5.2.17-150002.3.20.1 SUSE-SU-2026:4585-1
SUSE Multi Linux Manager Tools SLE-15 venv-salt-minion 3006.0-150002.5.22.1 SUSE-SU-2026:4585-1

Wolfi

ReleasePackageFixed inAdvisory
Wolfi rolling vitess-24 24.0.1-r2 —

Affected packages

EcosystemPackageAffectedFixedRecord
npm react-router >= 7.0.0, < 7.14.2 7.14.2 GHSA-49rj-9fvp-4h2h

Advisories 5

References