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Fencer Vulns
critical 9.4

CVE-2026-94572 json

In OpenStack Octavia before 18.0.1, the Amphora provider driver did not validate the listener and pool tls_ciphers field for control charac…

published 2026-09-21 48 d ago modified 2026-09-24 45 d ago also EUVD-2026-84118

cvss
9.4
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 45%
public exploits
0
none known

Summary

In OpenStack Octavia before 18.0.1, the Amphora provider driver did not validate the listener and pool tls_ciphers field for control characters. The value is written verbatim into the HAProxy configuration generated on the amphora, and thus an authenticated project member who owns a TLS-enabled load balancer can embed a newline and inject arbitrary HAProxy configuration directives. Only deployments using the Amphora provider are affected.

Patch / fix

  • OpenStack Octavia 16.1.0, 17.0.1, 18.0.1
  • octavia Debian 14 18.0.0-4

debian advisories DEBIAN-CVE-2026-94572

  • octavia Ubuntu 22.04 LTS 1:10.1.1-0ubuntu1.5
  • octavia Ubuntu 24.04 LTS 1:14.0.0-0ubuntu1.6
  • octavia Ubuntu 26.04 LTS 1:18.0.0-0ubuntu2.1

ubuntu advisories UBUNTU-CVE-2026-94572

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-94572 updated cvss 5.0

openstack-octavia: octavia: HAProxy configuration injection via tls_ciphers on pools and listeners

  • Red Hat OpenStack Platform 13 (Queens) python-octavia, openstack-octavia, openstack-octavia-api, openstack-octavia-common, openstack-octavia-worker, python-octavia-tests-golang, +4 more Red Hat OpenStack Platform 16.2 python3-octavia, openstack-octavia-api, openstack-octavia-common, openstack-octavia-worker, openstack-octavia-housekeeping, openstack-octavia-amphora-agent, +2 more
    affected: workaround, no fix planned “Will not fix”
  • Red Hat OpenStack Platform 17.1 python3-octavia, openstack-octavia-api, openstack-octavia-common, openstack-octavia-worker, openstack-octavia-housekeeping, openstack-octavia-amphora-agent, +2 more Red Hat OpenStack Platform 18.0 openstack-octavia
    affected: workaround, no fix available

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
total
Assessed
45 d ago

Exploit prediction

0.53% chance of exploitation in the next 30 days, higher than 45% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugs.launchpad.net https://bugs.launchpad.net/octavia/+bug/2162101 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 9.4 CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
CNA 4.0 9.4 CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

  • OpenStack Octavia

Classification

Weakness
  • CWE-94 Improper Control of Generation of Code

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.