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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.

PUBLISHED Reserved 2026-05-28 | Published 2026-05-28 | Updated 2026-05-30 | Assigner redhat




HIGH: 7.7CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

Problem types

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

Product status

Default status
affected

Default status
affected

Timeline

2026-05-18:Reported to Red Hat.
2026-05-28:Made public.

Credits

Red Hat would like to thank Thai Son Dinh, GitHub: @sondt99 (VinSOC) for reporting this issue.

References

access.redhat.com/security/cve/CVE-2026-9804 vdb-entry

bugzilla.redhat.com/show_bug.cgi?id=2482487 (RHBZ#2482487) issue-tracking

cve.org (CVE-2026-9804)

nvd.nist.gov (CVE-2026-9804)

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