Vulnerabilities
Misconfiguration
Compliance
CVE Vulnerabilities

CVE-2026-9804

Improper Link Resolution Before File Access ('Link Following')

Published: May 28, 2026 | Modified: Jun 30, 2026
CVSS 3.x
N/A
Source:
NVD
CVSS 2.x
RedHat/V2
RedHat/V3
7.7 IMPORTANT
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Ubuntu
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Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2026-9804
CWEhttps://cwe.mitre.org/data/definitions/59.html

A flaw was found in KubeVirts 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 pods filesystem. This leads to information disclosure, potentially exposing sensitive data.

Weakness

The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.

Affected Software

NameVendorStart VersionEnd Version
Red Hat Container Native Virtualization 4.17RedHatcontainer-native-virtualization/virt-exportserver-rhel9:1781757410*
Red Hat Container Native Virtualization 4.18RedHatcontainer-native-virtualization/virt-exportserver-rhel9:1781928221*
Red Hat Container Native Virtualization 4.19RedHatcontainer-native-virtualization/virt-exportserver-rhel9:1781590993*
Red Hat Container Native Virtualization 4.20RedHatcontainer-native-virtualization/virt-exportserver-rhel9:1781838712*
Red Hat Container Native Virtualization 4.21RedHatcontainer-native-virtualization/virt-exportserver-rhel9:1782012918*

Potential Mitigations

  • Follow the principle of least privilege when assigning access rights to entities in a software system.
  • Denying access to a file can prevent an attacker from replacing that file with a link to a sensitive file. Ensure good compartmentalization in the system to provide protected areas that can be trusted.

References

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