CVE-2026-42211: React Router is a router for React

Q: How do I fix CVE-2026-42211?

react-router: upgrade to 7.14.2. Exact commands for each OS are on this page.

Q: Is CVE-2026-42211 being exploited?

CVE-2026-42211 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-42211 affect?

CVE-2026-42211 affects react-router. Severity is high (CVSS 8.1). 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 app

Q: How urgent is CVE-2026-42211?

Priority 42/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 8.1REMOTEUPGRADE

CVE-2026-42211 is a high-severity flaw (CVSS 8.1) affecting react-router. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 app

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 64%)
CISA exploited list	No
Weakness	CWE-502
Published	2026-06-02
Last modified	2026-07-21

Publisher (CNA): GitHub, Inc. · Vendor: shopify

Last updated 2026-07-21 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-02 20:16 UTCPublished CVE record published
2026-07-21 19:10 UTCUpdated Record last modified

shopify react-router UPGRADE

Affected: >= 7.0.0 and < 7.14.2

Fixed in: 7.14.2

Safe to downgrade to: a release before 7.0.0

1. Check installed version

npm ls react-router

2. UPGRADE to 7.14.2

npm install react-router@">=7.14.2"

3. If no update is available yet, DOWNGRADE to a release before 7.0.0

npm view react-router versions npm install react-router@"<7.0.0"

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-42211?

react-router: upgrade to 7.14.2. Exact commands for each OS are on this page.

Is CVE-2026-42211 being exploited?

CVE-2026-42211 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-42211 affect?

CVE-2026-42211 affects react-router. Severity is high (CVSS 8.1). 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 app

How urgent is CVE-2026-42211?

Priority 42/100. High severity; Remotely exploitable, no login, no user action

Software pages

React vulnerabilities · Shopify vulnerabilities

Related CVEs

CVE-2026-55685 HIGH 7.5 UPGRADE React Router is a router for React
CVE-2026-53667 MEDIUM 6.9 UPGRADE React Router is a router for React
CVE-2026-53668 MEDIUM 6.9 UPGRADE React Router is a router for React
CVE-2026-53666 MEDIUM 6.1 UPGRADE React Router is a router for React
CVE-2026-53669 MEDIUM 6.1 UPGRADE React Router is a router for React

References

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