OpenStack Keystone before 26.0.1, 27.0.0, and 28.0.0 allows a /v3/ec2tokens or /v3/s3tokens request with a valid AWS Signature to provide Keystone authorization.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:54757 advisory.

    Red Hat OpenStack Platform provides the facilities for building, deploying and monitoring a private or     public infrastructure-as-a-service (IaaS) cloud running on commonly available physical hardware.

    Security Fix(es):

    * crypto/x509: golang: Denial of Service due to excessive resource consumption via crafted certificate     (CVE-2025-61729)

    * openstack-nova-compute: Arbitrary Host File Overwrite via Unconstrained qemu-img Format Handling in     OpenStack Nova (CVE-2026-24708)

    * pyasn1: pyasn1: Denial of Service due to memory exhaustion from malformed RELATIVE-OID (CVE-2026-23490)

    * golang: net/url: Memory exhaustion in query parameter parsing in net/url (CVE-2025-61726)

    * crypto/tls: crypto/tls: Incorrect certificate validation during TLS session resumption (CVE-2025-68121)

    * openstack-glance: OpenStack Glance: Server-Side Request Forgery leading to unauthorized internal network     access (CVE-2026-34881)

    * crypto/x509: Incorrect enforcement of email constraints in crypto/x509 (CVE-2026-27137)

    * net/url: Incorrect parsing of IPv6 host literals in net/url (CVE-2026-25679)

    * google.golang.org/grpc/grpc-go: google.golang.org/grpc/authz: gRPC-Go: Authorization bypass due to     improper HTTP/2 path validation (CVE-2026-33186)

    * etcd: etcd: Authorization bypass allows information disclosure and denial of service (CVE-2026-33413)

    * crypto/x509: golang: Go crypto/x509: Denial of Service via inefficient certificate chain validation     (CVE-2026-32281)

    * crypto/x509: golang: Go crypto/x509: Certificate validation bypass due to incorrect DNS constraint     application (CVE-2026-33810)

    * golang: internal/syscall/unix: Root.Chmod can follow symlinks out of the root (CVE-2026-32282)

    * crypto/tls: golang: Go crypto/tls: Denial of Service via multiple TLS 1.3 key update messages     (CVE-2026-32283)

    * crypto/x509: crypto/tls: golang: Go: Denial of Service vulnerability in certificate chain building     (CVE-2026-32280)

    * net: golang: Go net package: Denial of Service via long CNAME response in LookupCNAME (CVE-2026-33811)

    * golang.org/x/net/idna: golang: net/http: golang.org/x/net/idna: Privilege escalation via incorrect     Punycode label processing (CVE-2026-39821)

    * erlang: Erlang OTP public_key: Certificate chain forgery via improper trust chain validation     (CVE-2026-42789)

    * crypto/x509: golang: golang crypto/x509: Denial of Service via excessive processing of DNS SAN entries     (CVE-2026-27145)

    * oslo.messaging: openstack: OpenStack oslo.messaging: Man-in-the-middle attack via improper TLS hostname     verification (CVE-2026-44393)

    * erlang: Erlang OTP public_key: Certificate validation bypass allows hostname spoofing (CVE-2026-42790)

    * openstack-keystone: OpenStack Keystone: Unauthorized access and privilege escalation via AWS signature     validation flaw (CVE-2025-65073)

    * OpenStack Keystone: OpenStack Keystone: Unauthorized cross-project access due to improper validation in     EC2 credential creation (CVE-2026-43001)

    * openstack-keystone: OpenStack Keystone: Privilege escalation through EC2 credential creation     (CVE-2026-33551)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:28044 advisory.

    Keystone is a Python implementation of the OpenStack     (http://www.openstack.org) identity service API.

    Security Fix(es):

    * OpenStack Keystone: Privilege escalation through EC2 credential creation     (CVE-2026-33551)

    * OpenStack Keystone: Unauthenticated access to EC2/S3 token endpoints can grant Keystone authorization     (CVE-2025-65073)

    For more details about the security issue(s), including the impact, a CVSS     score, acknowledgments, and other related information, refer to the CVE     page listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2026:1958 advisory.

    Keystone is a Python implementation of the OpenStack     (http://www.openstack.org) identity service API.

    Security Fix(es):

    * OpenStack Keystone: Unauthorized access and privilege escalation via AWS     signature validation flaw (CVE-2025-65073)

    For more details about the security issue(s), including the impact, a CVSS     score, acknowledgments, and other related information, refer to the CVE     page listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Ubuntu 22.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-7926-1 advisory.

    Kay discovered that OpenStack Keystone incorrectly handled the ec2tokens and s3tokens APIs. A remote     attacker could possibly use this issue to obtain unauthorized access and escalate privileges.
    (CVE-2025-65073)

    It was discovered that OpenStack Keystone only validated the first 72 bytes of an application secret. An     attacker could possibly use this issue to bypass password complexity. (CVE-2021-3563)

    It was discovered that OpenStack Keystone had a time lag before a token should be revoked by the security     policy. A remote administrator could use this issue to maintain access for longer than expected.
    (CVE-2022-2447)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - OpenStack Keystone before 26.0.1, 27.0.0, and 28.0.0 allows a /v3/ec2tokens or /v3/s3tokens request with a     valid AWS Signature to provide Keystone authorization. (CVE-2025-65073)

Note that Nessus relies on the presence of the package as reported by the vendor.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - OpenStack Keystone before 26.0.1, 27.0.0, and 28.0.0 allows a /v3/ec2tokens or /v3/s3tokens request with a
    valid AWS Signature to provide Keystone authorization. (CVE-2025-65073)

ID	Name	Product	Family	Type	Severity
335312	RHEL 8 : Red Hat OpenStack Platform 16.2 security advisory (Important) (RHSA-2026:54757)	Nessus	Red Hat Local Security Checks	Local	high
322147	RHEL 9 : Red Hat OpenStack Platform 17.1 (openstack-keystone) (RHSA-2026:28044)	Nessus	Red Hat Local Security Checks	Local	medium
298931	RHEL 9 : Red Hat OpenStack Services on OpenShift 18.0 (openstack-keystone) (RHSA-2026:1958)	Nessus	Red Hat Local Security Checks	Local	high
278510	Ubuntu 22.04 LTS : OpenStack Keystone vulnerabilities (USN-7926-1)	Nessus	Ubuntu Local Security Checks	Local	high
275724	Linux Distros Unpatched Vulnerability : CVE-2025-65073	Nessus	Misc.	Local	high
436085	SCA: security update for keystone (GHSA-hcqg-5g63-7j9h)	Tenable Cloud Security	SCA Checks	Local	high
436085	SCA: security update for keystone (GHSA-hcqg-5g63-7j9h)	Tenable Self-Hosted Container Security	SCA Checks	Local	high

Detections

Analytics

CVE-2025-65073

high

Tenable Plugins

high

medium

high

high

high

high

high