CVE-2026-53667: React Router is a router for React

Q: How do I fix CVE-2026-53667?

react-router: upgrade to 7.18.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-53667 being exploited?

CVE-2026-53667 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-2026-53667 affect?

CVE-2026-53667 affects react-router. Severity is medium (CVSS 6.9). React Router is a router for React. In versions 7.11.0 through 7.17.0, the RSCErrorHandler is missing protocol validation, allowing for redirects from untrusted sources. This issue is a follow up to CVE-2026-53667, and only affects consumin

Q: How urgent is CVE-2026-53667?

Priority 31/100. No elevated risk signals yet.

Routine

MEDIUM 6.9UPGRADE

CVE-2026-53667 is a medium-severity flaw (CVSS 6.9) 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 7.11.0 through 7.17.0, the RSCErrorHandler is missing protocol validation, allowing for redirects from untrusted sources. This issue is a follow up to CVE-2026-53667, and only affects consuming applications if they are using the unstable RSC APIs. This issue has been fixed in version 7.18.0.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.9 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.4% (top 72%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-07-27
Last modified	2026-10-24

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

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-27 22:17 UTCPublished CVE record published
2026-10-24 13:10 UTCUpdated Record last modified

shopify react-router UPGRADE

Affected: >= 7.11.0 and < 7.18.0

Fixed in: 7.18.0

Safe to downgrade to: a release before 7.11.0

1. Check installed version

npm ls react-router

2. UPGRADE to 7.18.0

npm install react-router@">=7.18.0"

3. If no update is available yet, DOWNGRADE to a release before 7.11.0

npm view react-router versions npm install react-router@"<7.11.0"

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-2026-53667?

react-router: upgrade to 7.18.0. Exact commands for each OS are on this page.

Is CVE-2026-53667 being exploited?

CVE-2026-53667 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-2026-53667 affect?

CVE-2026-53667 affects react-router. Severity is medium (CVSS 6.9). React Router is a router for React. In versions 7.11.0 through 7.17.0, the RSCErrorHandler is missing protocol validation, allowing for redirects from untrusted sources. This issue is a follow up to CVE-2026-53667, and only affects consumin

How urgent is CVE-2026-53667?

Priority 31/100. No elevated risk signals yet.

Software pages

React vulnerabilities

Related CVEs

CVE-2026-55685 HIGH 7.5 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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