Is there a public exploit for CVE-2026-34077?

No public exploit for CVE-2026-34077 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-34077?

CVE-2026-34077 scores CVSS 7.5 (v3.1), rated high. EPSS puts the chance of exploitation in the next 30 days at 0.29%.

What does CVE-2026-34077 affect?

CVE-2026-34077 affects remix-run react-router, turbo-stream.

7.5 High

React Router is a router for React.

CVE-2026-34077

A DoS vulnerability exists in the React Router v7 [Framework Mode](https://reactrouter.com/start/modes#framework), as well as Remix v2.9.0+ with [Single Fetch](https://v2.remix.run/docs/guides/single-fetch) enabled. In some scenarios the underlying serialization algorithm can become a bottleneck when encoding specific types of data into server responses. Please upgrade to React Router v7.14.0 or later. [!NOTE] This does not impact your React Router application if you are using [Declarative Mode](https://reactrouter.com/start/modes#declarative) ( ) or [Data Mode](https://reactrouter.com/start/modes#data) (createBrowserRouter/ ).

Assessment

CVSS: 7.5 (v3.1)
Severity: High
EPSS: 0.29% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 2 June 2026
Last updated: 22 July 2026
Affected: remix-run · react-router · turbo-stream · react-router · turbo-stream
Weakness: CWE-770
Assigner: security-advisories@github.com

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

At the source

References

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