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CVE-2026-34077· NVD / CVE Program· CNA GitHub_M

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

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.

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Jun 2, 2026
Updated
Jul 22, 2026
EPSS
0.5% · 37th percentile
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Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.5%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · GitHub_M
7.5
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Noroxi analysis

No Noroxi analysis for this record yet

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Affected systems

VendorProduct
shopifyreact-router
turbo-streamturbo stream

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • shopify react-router7.0.0 and later · before 7.14.0
  • turbo-stream turbo streambefore 3.0.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

  • remix-run react-router

    • >= 7.0.0, < 7.14.0affected

  • remix-run turbo-stream

    • < 3.0.0affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
npmreact-routerfrom 7.0.0 · before 7.14.07.14.0
npmturbo-streambefore 3.0.03.0.0
openSUSE:Tumbleweedagama-web-uibefore 22+143.ee15dea20-46.122+143.ee15dea20-46.1

Same product

shopify: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-55685React Router: Unauthenticated Denial of Service via Inefficient Route Matching
    34Monitor
  • CVE-2026-42211React Router's vendored turbo-stream v2 allows arbitrary constructor invocation via TYPE_ERROR deserialization leading to Unauth RCE
    32Monitor
  • CVE-2026-21884React Router SSR XSS in ScrollRestoration
    32Monitor
  • CVE-2026-42342React Router vulnerable to DoS via unbounded path expansion in __manifest endpoint
    30Monitor
  • CVE-2025-59057React Router has XSS Vulnerability
    30Monitor
  • CVE-2026-53668React Router: Open redirect can lead to XSS
    27Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
remix-run react-router7.13.2 · descriptionVendor (CNA)
npm:react-router7.14.0Package registry (OSV)
npm:turbo-stream3.0.0Package registry (OSV)
opensuse:agama-web-ui22+143.ee15dea20-46.1 · openSUSE:TumbleweedPackage registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-770 · Allocation of Resources Without Limits or Throttling

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records