Bug 2538157 (CVE-2026-94571)

Summary: CVE-2026-94571 openstack-octavia: octavia: HAProxy configuration injection via L7 policy redirect_url and redirect_prefix
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: eglynn, jjoyce, jpretori, jschluet, lhh, mburns, mgarciac
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in OpenStack Octavia. An authenticated user who can create or update L7 policies on their own load balancer can inject arbitrary HAProxy configuration directives through the redirect_url or redirect_prefix fields. The URL validator does not reject control characters such as tabs and newlines, and the raw input is written directly into the HAProxy configuration file on the Amphora VM. This can be used to change redirect behavior and, by injecting HAProxy program directives, to run commands on the Amphora.
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Description OSIDB Bzimport 2026-09-22 17:20:01 UTC 
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.