OpenStack 2026.2 “Hibiscus,” released September 30, 2026, adds DNS security capabilities in Designate and expands Nova support for AMD SEV-SNP and Intel TDX confidential virtual machines. These are release-level capabilities, not security switches activated by an upgrade: operators still need compatible infrastructure and configuration, and the release announcement describes the DNS changes at a high level rather than as a deployment guide.
What Hibiscus changes
Hibiscus is the OpenStack project’s 34th release. The OpenStack Foundation describes its six-month development cycle as involving around 600 contributors, roughly 11,500 code changes, and approximately 1.6 million CI jobs run by OpenDev Zuul. Those activity figures describe development and testing volume; they do not measure the security effectiveness of the new features.
The release announcement groups the relevant changes into two areas: DNS security in Designate, OpenStack’s DNS-as-a-service component, and expanded confidential-computing support in Nova, the compute service. The announcement also reported 42 OpenStack Security Advisories and 13 OpenStack Security Notes issued so far in 2026 as of September 30; those totals are not evidence that a particular Hibiscus feature has been independently security-tested. OpenStack’s Hibiscus announcement has the release overview, and the Hibiscus schedule records the April 2–September 30, 2026 coordinated cycle.
What Designate’s DNS security features cover
The Hibiscus summary names four Designate improvements: stronger cross-tenant isolation, stronger authentication, TLSA/DANE support, and tooling to help operators prepare for post-quantum cryptography. The announcement does not specify API behavior, configuration steps, interoperability details, or migration procedures for these features, so deployments should not infer particular settings or guarantees from the summary alone.
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TLSA/DANE support is not automatic secure DNS
TLSA records are used by DANE to associate certificates or public keys with domain names. Their presence in the feature summary does not mean a cloud has automatically configured DNSSEC, published valid records, or established a trusted validation path. Operators need implementation-specific Designate documentation and a clear understanding of the DNS resolvers and validation behavior in their environment before relying on DANE.
Post-quantum preparation is not end-to-end post-quantum security
The announcement says Hibiscus includes tooling to prepare for post-quantum cryptography. It does not claim that OpenStack, Designate, or a deployment’s DNS traffic is now protected end to end with post-quantum algorithms. Treat this as preparation support, not proof that cryptographic components have been migrated.
What Nova’s confidential-computing support means
Hibiscus expands Nova support for AMD SEV-SNP and Intel TDX. The release announcement characterizes these technologies as providing hardware-backed memory encryption, stronger workload isolation, and attestation for sensitive workloads. Actual availability depends on compatible compute hardware, firmware, the host virtualization stack, and operator configuration; upgrading the control plane alone does not make existing hosts capable of running confidential instances.
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Nova’s upstream administration guides describe support added in Nova 34.0.0, the Hibiscus release. Distributions may package different component versions or require additional deployment procedures, so operators should also check their distribution’s support matrix and firmware instructions.
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Intel TDX prerequisites and attestation limits
Intel TDX requires TDX-capable Intel CPUs, enabled host firmware, and a supported KVM, QEMU, and libvirt stack. Operators must configure eligible images or flavors and the appropriate firmware settings. The Nova Intel TDX administration guide details those requirements.
Attestation needs separate operational attention. Nova provides plumbing for evidence generation, but does not manage the Quote Generation Service (QGS) or itself verify attestation. Operators must install and manage the QGS on TDX hosts, and a relying party must verify the resulting quote. Nova’s guide says attestation was tested but is not actively supported or guaranteed by Nova. A confidential VM starting successfully is therefore not evidence that remote attestation is working.
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AMD SEV-SNP prerequisites
SEV-SNP requires capable AMD compute hosts and a suitable libvirt/KVM or QEMU stack. The Nova guide also specifies firmware and machine-type requirements, including UEFI and Q35 constraints. Operators select the amd-sev-snp memory-encryption model through flavor extra specs or image metadata. See the Nova AMD SEV administration guide for the full requirements and configuration details.
Choosing between TDX and SEV-SNP
Neither technology is established by these sources as universally more secure or easier to deploy. The practical choice depends on what is already available and supportable in the target cloud.
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|---|---|---|
| Hardware and firmware | TDX-capable Intel CPU and enabled host firmware are required. | Capable AMD compute host and required firmware support are required. |
| Host software | Supported KVM, QEMU, and libvirt stack. | Suitable libvirt/KVM or QEMU stack. |
| Instance selection | Configure eligible flavors or images and firmware settings. | Select amd-sev-snp through flavor extra specs or image metadata; meet UEFI and Q35 constraints. |
| Attestation operations | Operator manages QGS; a relying party verifies quotes. Nova does not manage QGS or verify attestation. | The cited Nova guide establishes host and instance prerequisites; consult the guide and deployment documentation for the attestation architecture required by the environment. |
Before choosing, compare compatible CPU and firmware availability across the fleet, host-stack versions, per-host capacity constraints, and who will own attestation services and quote verification. A mixed fleet may make one option more practical than the other for particular compute pools.
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Upgrade and lifecycle context
Hibiscus is a non-SLURP release. OpenStack says operators on the preceding SLURP release, Gazpacho, may skip Hibiscus and upgrade directly to 2027.1 Indri, expected in March 2027. Confirm that route against the deployment’s packaging and local maintenance policy rather than treating it as universal upgrade advice.
The official OpenStack series index lists Hibiscus as maintained and estimates its end of life as April 26, 2028. That is an estimate and may change; check the index when planning a maintenance window. The release date and series status are also recorded in the release announcement.
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