Improper Handling of Length Parameter Inconsistency in Rack - CVE-2026-34831
Published: April 2, 2026
Vulnerability identifier: #VU124835
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-34831
CWE-ID: CWE-130
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Rack
Affected software:
Rack
Rack
Detailed vulnerability description
The vulnerability allows a remote attacker to compromise the target system.
The vulnerability exists due to "Content-Length" mismatch in "Rack::Files" error responses. A remote attacker can cause response parsing inconsistencies or response desynchronization.
How to mitigate CVE-2026-34831
Install updates from vendor's website.