Resource exhaustion in turbo-stream - CVE-2026-34077
Published: June 19, 2026
Vulnerability identifier: #VU134922
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-34077
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Jacob Ebey
Affected software:
turbo-stream
turbo-stream
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled resource consumption in the single-fetch serialization algorithm when encoding specific types of data into server responses. A remote attacker can supply crafted input that is reflected into a server response to cause a denial of service.
Only React Router v7 framework mode and Remix with single fetch enabled are vulnerable.
How to mitigate CVE-2026-34077
Install security update from vendor's website.