React Router: Arbitrary Constructor Injection via deserializeErrors() in React Router SSR Hydration

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-53666
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-27 22:17:30 UTC
Updated2026-08-03 14:04:25 UTC
DescriptionReact Router is a router for React. In versions 6.4.0 through 7.17.0, if application code was written in a way that allows attacker-supplied input to overwrite certain aspects of errors caught by the SSR process, then it was possible for an attacker to trigger unexpected constructor execution on the client, which would in turn trigger an outbound network request. This is only possible with very specific (and unlikely) application-layer code. Note that this does not impact an application if it is using Declarative Mode. It only impacts Framework Mode and Data Mode applications that perform manual SSR/hydration. This issue has been fixed in version 7.18.0.

Risk And Classification

Primary CVSS: v3.1 6.1 MEDIUM from [email protected]

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

EPSS: 0.004150000 probability, percentile 0.341480000 (date 2026-08-04)

Problem Types: CWE-470 | CWE-470 CWE-470: Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.1MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
3.1CNADECLARED6.1MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Shopify React-router All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Remix-run React-router affected >= 6.4.0, < 7.18.0 Not specified

References

ReferenceSourceLinkTags
github.com/remix-run/react-router/commit/9d22943fd46c8ae4b08236425fa3549... [email protected] github.com Patch
github.com/remix-run/react-router/pull/15175 [email protected] github.com Issue Tracking, Patch
github.com/remix-run/react-router/security/advisories/GHSA-337j-9hxr-rhxg [email protected] github.com Third Party Advisory
github.com/remix-run/react-router/blob/main/CHANGELOG.md [email protected] github.com Release Notes
github.com/remix-run/react-router/releases/tag/[email protected] [email protected] github.com Release Notes
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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