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CVE-2026-19706— Openshift/installer: openshift installer: unconditional csr approval during agent-based installation (abi) bootstrap

Quick assessment

Affected

Red Hat Assisted Installer for Red Hat OpenShift Container Platform 2

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 ABI 引导（bootstrap）阶段，引导节点的服务在未进行身份验证的情况下，会批准并签署所有证书签名请求（CSR）。安装网络中的攻击者可以获取未经验证的 Ignition 配置文件（通过 22623 或 22624 端口），从中提取受限的 kubeconfig，提交一个通用名称（CN）为的 CSR，接收已签发的证书，从而获得完整的权限。该漏洞仅在短暂的引导窗口期内可被利用。

CVSS 8.3 · High Updated Nov 10, 2026

Possible ATT&CK Techniques 3 AI

T1086 T1078 · Valid Accounts T1190 · Exploit Public-Facing Application

Affected Version Matrix 13

Vendor	Product	Version Range	Status
Red Hat	Assisted Installer for Red Hat OpenShift Container Platform 2	`any`	unaffected
		`any`	affected
		`any`	affected
Red Hat	Multicluster Engine for Kubernetes	`any`	affected
		`any`	affected
		`any`	affected
		`any`	affected
Red Hat	Red Hat OpenShift Container Platform 4	`any`	affected
		`any`	affected
		`any`	unaffected
		`any`	unaffected
Red Hat	Red Hat OpenShift Container Platform 5	`any`	affected
		`any`	unaffected

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Vulnerability Information

Have questions about the vulnerability? See if Shenlong's analysis helps!

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Vulnerability Title

Openshift/installer: openshift installer: unconditional csr approval during agent-based installation (abi) bootstrap

Source: CVE Program / CVE List V5

Vulnerability Description

During ABI bootstrap, the bootstrap node's approve-csr.service approves and signs every CSR without identity validation. An attacker on the install network can retrieve the unauthenticated Ignition file (ports 22623/22624), extract a limited kubeconfig, submit a CSR for CN=system:admin, receive the signed certificate, and gain full cluster-admin access. Exploitable only during the narrow bootstrap window.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Source: CVE Program / CVE List V5

Vulnerability Type

关键功能的认证机制缺失

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE
Red Hat	Assisted Installer for Red Hat OpenShift Container Platform 2	-	`cpe:/a:redhat:assisted_installer:2`
Red Hat	Assisted Installer for Red Hat OpenShift Container Platform 2	-	`cpe:/a:redhat:assisted_installer:2`
Red Hat	Assisted Installer for Red Hat OpenShift Container Platform 2	-	`cpe:/a:redhat:assisted_installer:2`
Red Hat	Multicluster Engine for Kubernetes	-	`cpe:/a:redhat:multicluster_engine`
Red Hat	Multicluster Engine for Kubernetes	-	`cpe:/a:redhat:multicluster_engine`
Red Hat	Multicluster Engine for Kubernetes	-	`cpe:/a:redhat:multicluster_engine`
Red Hat	Multicluster Engine for Kubernetes	-	`cpe:/a:redhat:multicluster_engine`
Red Hat	Red Hat OpenShift Container Platform 4	-	`cpe:/a:redhat:openshift:4`
Red Hat	Red Hat OpenShift Container Platform 4	-	`cpe:/a:redhat:openshift:4`
Red Hat	Red Hat OpenShift Container Platform 4	-	`cpe:/a:redhat:openshift:4`
Red Hat	Red Hat OpenShift Container Platform 4	-	`cpe:/a:redhat:openshift:4`
Red Hat	Red Hat OpenShift Container Platform 5	-	`cpe:/a:redhat:openshift:5`
Red Hat	Red Hat OpenShift Container Platform 5	-	`cpe:/a:redhat:openshift:5`

II. Public POCs for CVE-2026-19706

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-19706

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Other References for CVE-2026-19706 (4)

https://kubernetes.io/docs/reference/access-authn-authz/certificate-signing-requests/
https://docs.redhat.com/en/documentation/openshift_container_platform/4.22/html/installing_an_on-premise_cluster_with_the_agent-based_installer/index
https://access.redhat.com/security/cve/CVE-2026-19706 vdb-entry x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2515215 issue-tracking x_refsource_REDHAT

https://www.cve.org/CVERecord?id=CVE-2026-19706

Same Patch Batch · Red Hat · 2026-11-09 · 22 CVEs total

CVE-2026-12977	8.8 HIGH	Org.wildfly.core/wildfly-server: wildfly: rbac bypass in wildfly deployment-operation hand
CVE-2026-119610	8.2 HIGH	Gstreamer1-plugins-good: gstreamer1-plugins-good: out-of-bounds heap read in mtap16/mtap24
CVE-2026-119079	7.5 HIGH	Krb5: mit krb5 kdc unauthenticated cpu dos via quadratic asn.1 sequence of decoding
CVE-2026-121629	7.5 HIGH	Gst-plugins-good: gst-plugins-good: local file disclosure via unvalidated file:// uris in
CVE-2026-112322	7.5 HIGH	Krb5: mit krb5 kadmind unauthenticated cpu dos via auth_gssapi client states cleanup
CVE-2026-112323	7.5 HIGH	Krb5: mit krb5 kadmind unauthenticated memory exhaustion via failed auth_gssapi_init reque
CVE-2026-112320	7.5 HIGH	Krb5: mit krb5 kadmind unauthenticated memory leak dos via gss-rpc auth flavor switching
CVE-2026-112321	7.5 HIGH	Krb5: mit krb5 kadmind unauthenticated memory leak dos via auth_gssapi_init error paths
CVE-2026-112314	7.5 HIGH	Krb5: mit krb5 gss-rpc client memory leak on xid mismatch retries
CVE-2026-84503	6.7 MEDIUM	Ansible-core: ansible-core: ansible.builtin.git invokes git without a `--` separator, allo
CVE-2026-112316	6.5 MEDIUM	Krb5: mit krb5 kadmind authenticated memory leak dos in xdr_krb5_tl_data() decode failure
CVE-2026-112318	6.5 MEDIUM	Krb5: mit krb5 kadmind authenticated dos exploiting dereference of null policy name pointe
CVE-2026-112319	6.5 MEDIUM	Krb5: mit krb5 kadmind authenticated memory exhaustion dos via unbounded rpc xdr allocatio
CVE-2026-125040	6.5 MEDIUM	Gst-plugins-base: gst-plugins-base: quadratic regex processing in srt/webvtt subtitle pars
CVE-2026-121611	6.5 MEDIUM	Gstreamer1-plugins-bad-free: gst-plugins-bad: use of uninitialized gsth265hrdparams in gst
CVE-2026-121601	6.1 MEDIUM	Gstreamer1-plugins-bad-free: gstreamer1-plugins-bad-free: out-of-bounds read in mxfdemux v
CVE-2026-122056	5.9 MEDIUM	Openscap: one-byte heap buffer overflow in sds-compose may lead to denial-of-service
CVE-2026-125041	5.5 MEDIUM	Gst-plugins-good: gst-plugins-good: qtdemux out-of-bounds heap read from invalid uncompres
CVE-2026-112317	5.3 MEDIUM	Krb5: mit krb5 kdc unauthenticated memory leak dos in kdb keytab key decryption error path
CVE-2026-112315	5.3 MEDIUM	Krb5: mit krb5 kadmind unauthenticated memory leak dos in rpcsec_gss buffer decode failure

Showing top 20 of 22 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Assisted Installer for Red Hat OpenShift Container Platform 2

CVE-2026-101295
Oc-mirror: oc-mirror: path traversal / arbitrary file write

Same vendor: Red Hat

Same weakness: CWE-306