CVE-2026-42211Network attack vector

Remote code execution via arbitrary constructor invocation

Published Jun 2, 2026 · Updated Jun 2, 2026

Remote code execution in Shopify React Router 7.0.0 through 7.14.1 allows remote attackers to execute code through Framework Mode requests. The vendored turbo-stream v2 TYPE_ERROR deserializer resolves a polluted constructor property and invokes it while rebuilding an error. Exploitation requires a separate prototype pollution flaw in application code and two external requests; Declarative and Data Mode applications are unaffected.

CVSS severity8.1
High
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Remote code execution in Shopify React Router 7.0.0 through 7.14.1 allows remote attackers to execute code through Framework Mode requests. The vendored turbo-stream v2 TYPE_ERROR deserializer resolves a polluted constructor property and invokes it while rebuilding an error. Exploitation requires a separate prototype pollution flaw in application code and two external requests; Declarative and Data Mode applications are unaffected.

The record

CVE
CVE-2026-42211
Published
Jun 2, 2026
Updated
Jun 2, 2026
Vendor
Shopify
Product
React Router
Classifications
CWE-502, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 2, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 7.0.0, < 7.14.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Shopify · React Routerversion=>= 7.0.0, < 7.14.2

Published CVSS scores

8.1GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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