CVE-2026-34077: React Router is a router for React

Routine

HIGH 7.5REMOTEUPGRADEUPGRADE

CVE-2026-34077 is a high-severity flaw (CVSS 7.5) affecting react-router, turbo stream. 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 7.7.0 through 7.13.1, when using React Router's unstable React Server Components (RSC) APIs, there is a potential client-side Cross-Site Scripting (XSS) vulnerability in the RSC redirect handling if redirects come from untrusted sources. This does not impact applications that are not using the unstable RSC APIs in React Router. This is patched in version 7.13.2.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 78%)
CISA exploited list	No
Weakness	CWE-770
Published	2026-06-02
Last modified	2026-07-22

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

Last updated 2026-07-22 · 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
2026-07-22 19:10 UTCUpdated Record last modified

shopify react-router UPGRADE

Affected: >= 7.0.0 and < 7.14.0

Fixed in: 7.14.0

Safe to downgrade to: a release before 7.0.0

1. Check installed version

npm ls react-router

2. UPGRADE to 7.14.0

npm install react-router@">=7.14.0"

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.

turbo-stream turbo stream UPGRADE

Affected: < 3.0.0

Fixed in: 3.0.0

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls turbo-stream

2. UPGRADE to 3.0.0

npm install turbo-stream@">=3.0.0"

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-2026-34077?

react-router: upgrade to 7.14.0; turbo stream: upgrade to 3.0.0. Exact commands for each OS are on this page.

Is CVE-2026-34077 being exploited?

CVE-2026-34077 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-2026-34077 affect?

CVE-2026-34077 affects react-router, turbo stream. Severity is high (CVSS 7.5). React Router is a router for React. In versions 7.7.0 through 7.13.1, when using React Router's unstable React Server Components (RSC) APIs, there is a potential client-side Cross-Site Scripting (XSS) vulnerability in the RSC redirect handl

How urgent is CVE-2026-34077?

Priority 37/100. 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

← Back to latest CVEs