CVE-2026-55685

Summary

React Router: Unauthenticated Denial of Service via Inefficient Route Matching

Severity

high

EPSS

0.7% (p53)

CWE

CWE-400, CWE-407

Also known as

GHSA-chx6-hx7r-mcp5

Published

2026-07-24

Updated

2026-07-24

Advisory details

This is a follow up to https://github.com/remix-run/react-router/security/advisories/GHSA-8x6r-g9mw-2r78 that covers additional reported scenarios in which the manifest endpoint could be accessed via unauthenticated targeted requests that would put heavy load on the server and slow down response times.

[!NOTE] This only impacts Framework Mode applications. This does not impact your application if you are using Declarative or Data Mode.

References

• https://github.com/advisories/GHSA-chx6-hx7r-mcp5
• https://github.com/remix-run/react-router/security/advisories/GHSA-chx6-hx7r-mcp5
• https://github.com/remix-run/react-router/pull/15186
• https://github.com/remix-run/react-router/commit/09e6020d1950e54f361f7ad00938ecd4dde60929
• https://github.com/remix-run/react-router/blob/main/CHANGELOG.md#v7180
• https://github.com/remix-run/react-router/releases/tag/react-router@7.18.0

Related advisories

• GHSA-f2hq-32vh-53cc — high · npm/postal-mime
• CVE-2026-115585 — high · PyPI/pypdf
• CVE-2026-75507 — high · PyPI/graphql-core
• CVE-2026-114138 — high · PyPI/djangorestframework
• CVE-2026-96640 — high · PyPI/Pillow
• CVE-2026-113729 — high · Go/github.com/moov-io/signedxml
• CVE-2026-111758 — high · npm/markdown-it
• CVE-2026-111759 — high · npm/markdown-it

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