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CVE-2026-9804— Kubevirt: kubevirt: vmexport directory symlink escape enables exporter pod file read

Quick assessment

Affected
Red Hat Red Hat Container Native Virtualization 4.17
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.

Kubevirt是KubeVirt开源的一款虚拟机管理器。 KubeVirt存在后置链接漏洞，该漏洞源于VMExport目录端点中的路径遍历问题，可能导致具有特定命名空间级别访问权限的攻击者通过在被导出的文件系统持久卷声明中放置指向其指定挂载根目录之外的符号链接，读取导出器Pod文件系统中的任意文件，从而导致信息泄露。

CVSS 7.7 · High EPSS 0.72% · P52

Affected Version Matrix 6

VendorProduct Version RangeStatus
Red Hat Red Hat Container Native Virtualization 4.17 1781757410< * unaffected
Red Hat Red Hat Container Native Virtualization 4.18 1781928221< * unaffected
Red Hat Red Hat Container Native Virtualization 4.19 1781590993< * unaffected
Red Hat Red Hat Container Native Virtualization 4.20 1781838712< * unaffected
Red Hat Red Hat Container Native Virtualization 4.21 1782012918< * unaffected
Red Hat Red Hat OpenShift Virtualization 4 any affected
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I. Basic Information for CVE-2026-9804

Vulnerability Information
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Vulnerability Title
Kubevirt: kubevirt: vmexport directory symlink escape enables exporter pod file read
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in KubeVirt's virt-exportserver component. An attacker with specific namespace-level access can exploit a path traversal vulnerability in the VMExport directory endpoint. By placing a symbolic link (symlink) within an exported filesystem Persistent Volume Claim (PVC) that points outside its designated mount root, the attacker can read arbitrary files from the exporter pod's filesystem. This leads to information disclosure, potentially exposing sensitive data.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在文件访问前对链接解析不恰当(链接跟随)
Source: CVE Program / CVE List V5
Vulnerability Title
Kubevirt 后置链接漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Kubevirt是KubeVirt开源的一款虚拟机管理器。 KubeVirt存在后置链接漏洞，该漏洞源于VMExport目录端点中的路径遍历问题，可能导致具有特定命名空间级别访问权限的攻击者通过在被导出的文件系统持久卷声明中放置指向其指定挂载根目录之外的符号链接，读取导出器Pod文件系统中的任意文件，从而导致信息泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Container Native Virtualization 4.17 1781757410 ~ * cpe:/a:redhat:container_native_virtualization:4.17::el9
Red Hat Red Hat Container Native Virtualization 4.18 1781928221 ~ * cpe:/a:redhat:container_native_virtualization:4.18::el9
Red Hat Red Hat Container Native Virtualization 4.19 1781590993 ~ * cpe:/a:redhat:container_native_virtualization:4.19::el9
Red Hat Red Hat Container Native Virtualization 4.20 1781838712 ~ * cpe:/a:redhat:container_native_virtualization:4.20::el9
Red Hat Red Hat Container Native Virtualization 4.21 1782012918 ~ * cpe:/a:redhat:container_native_virtualization:4.21::el9
Red Hat Red Hat OpenShift Virtualization 4 - cpe:/a:redhat:container_native_virtualization:4

II. Public POCs for CVE-2026-9804

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III. Intelligence Information for CVE-2026-9804

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Vendor Advisories for CVE-2026-9804 (2)

Other References for CVE-2026-9804 (5)

Same Patch Batch · Red Hat · 2026-05-28 · 14 CVEs total

CVE-2026-4408 9.0 CRITICAL Samba: remote code execution in samr
CVE-2026-9795 7.3 HIGH Keycloak: keycloak: privilege escalation via improper scope mapping enforcement
CVE-2026-44604 7.0 HIGH Rpm: command injection in rpmuncompress dountar() via unescaped archive top-level director
CVE-2026-9802 6.8 MEDIUM Keycloak: keycloak: unauthorized account access via replayed refresh tokens after cluster
CVE-2026-9792 6.5 MEDIUM Keycloak: keycloak: security restriction bypass allows unauthorized ropc token acquisition
CVE-2026-9796 6.5 MEDIUM Keycloak: keycloak: privilege escalation via time-of-check to time-of-use (toctou) vulnera
CVE-2026-9793 5.9 MEDIUM Keycloak: keycloak: security policy bypass in jwe-encrypted request object processing
CVE-2026-9794 5.3 MEDIUM Keycloak: keycloak: information disclosure via saml ecp endpoint
CVE-2026-9803 5.3 MEDIUM Keycloak: keycloak: denial of service via malformed authorization header
CVE-2026-9801 4.9 MEDIUM Keycloak: keycloak: denial of service via malformed ldap password policy response
CVE-2026-9791 4.3 MEDIUM Keycloak-rhel9: organization data leak after feature disabled in keycloak
CVE-2026-9798 4.3 MEDIUM Keycloak: keycloak: brute-force protection bypass in ciba flow
CVE-2026-10028 4.3 MEDIUM Glib-networking: infinite loop in glib-networking gnutls backend allows remote denial of s

IV. Related Vulnerabilities

Same vendor: Red Hat
Same weakness: CWE-59

V. Comments for CVE-2026-9804

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