npm/react-router CVE-2026-34077: high 7.5, EPSS 0.29%

React Router vulnerable to Denial of Service via reflected user input in single-fetch

Action: Upgrade react-router to 7.14.0 or later.

npm i react-router@7.14.0

Affected

Fixed versions

Sources

• osv: GHSA-rxv8-25v2-qmq8
• https://github.com/remix-run/react-router/security/advisories/GHSA-rxv8-25v2-qmq8
• https://nvd.nist.gov/vuln/detail/CVE-2026-34077
• https://github.com/remix-run/react-router/commit/59811921d3c7d599077b8cadccdcd65a233165e0
• https://github.com/jacob-ebey/turbo-stream/blob/v2.4.1/src/flatten.ts#L175-L177
• https://github.com/jacob-ebey/turbo-stream/blob/v2.4.1/src/unflatten.ts#L185-L189
• https://github.com/remix-run/react-router

CVE-2026-34077 · published 2026-06-04T15:23:51Z · modified 2026-06-04T15:41:24.712338Z · JSON