CVE-2012-6109: lib/rack/multipart.rb in Rack before 1.1.4, 1.2.x before 1.2.6, 1.3.x before 1.3.7, and 1.4.x before 1.4.2...

Security readout for executives and security teams

This Rack flaw can let a remote requester make affected Ruby web applications hang while parsing a malformed multipart header. The known impact is denial of service, not data theft or code execution. Public sources identify fixed Rack versions, but the bundle provides no CVSS score and no evidence of active exploitation. Exposure is most likely in older Ruby/Rack applications that accept multipart form uploads or run through distribution packages containing vulnerable Rack branches. Current exposure depends on deployed Rack versions and whether vendor backports were applied. Address during normal vulnerability remediation, with higher urgency for public upload endpoints on unsupported Ruby stacks. The business risk is service availability disruption; evidence does not support emergency treatment for data compromise or active exploitation. Mitigation focus: Upgrade Rack to the fixed version for the deployed branch.; Apply relevant Red Hat advisories if using packaged Rack builds.; Check vendor guidance for backported fixes in distribution packages..

Prepared

Jun 24, 2026, 11:46 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.