What’s Vulnerable › Vulnerabilities

CVE-2026-94571

• Severity: critical (CVSS 9.4 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-21 · updated 2026-09-22
• Weakness: CWE-94

Description

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; from 17.0.0 before 17.0.1; from 18.0.0 before 18.0.1 — fixed in 16.1.0, 17.0.1, 18.0.1

How to fix

Upgrade to a fixed version: OpenStack Octavia 16.1.0, 17.0.1, 18.0.1. Check the vendor advisory for mitigations.

References

• https://bugs.debian.org/1148175
• https://bugs.launchpad.net/octavia/+bug/2162103
• https://bugs.launchpad.net/octavia/+bug/2167565
• https://opendev.org/openstack/octavia/commit/bad7074621562d90a38be4639c1ab3e245f5bf39
• https://openwall.com/lists/oss-security/2026/09/21/6
• https://security.openstack.org/ossa/OSSA-2026-039.html

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