CVE-2026-94571: Openstack Octavia

Critical severity, CVSS 9.4. EPSS: 0.5% chance of exploitation in the next 30 days.

In OpenStack Octavia before 18.0.1, the Amphora provider driver did not reject control characters in the L7 policy redirect_url and redirect_prefix fields. The RFC 3986 URL validator percent-encodes control characters before validating, and thus newlines passed structural checks, but Octavia stored and wrote the raw unencoded value directly into the HAProxy configuration generated on the amphora. An authenticated project member who owns a load balancer can therefore inject arbitrary HAProxy directives through a REDIRECT_TO_URL L7 policy. Only deployments using the Amphora provider are affected.

Affected products

• Openstack Octavia: from 0.8.0, before 16.1.0 (fixed in 16.1.0); from 17.0.0, before 17.0.1 (fixed in 17.0.1); from 18.0.0, before 18.0.1 (fixed in 18.0.1)

Published 2026-09-21. Last modified 2026-09-22.