Description
Kata Containers is an open source project focusing on a standard implementation of lightweight Virtual Machines (VMs) that perform like containers. From v3.4.0 to v3.28.0, an oversight in the CopyFile policy (and perhaps the CopyFile handler) allows untrusted hosts to write to arbitrary locations inside the guest workload image. This can be used to overwrite binaries inside the guest and exfiltrate data from containers; even those running inside CVMs. This vulnerability is fixed in v3.29.0.
Affected products
katacontainers: confidential containers; katacontainers: kata containers
References8
- github.com/kata-containers/kata-containers/commit/1b9e49eb2763a… Patch
- github.com/kata-containers/kata-containers/security/advisories/… Third Party Advisory
- www.openwall.com/lists/oss-security/2026/05/13/2 Mailing ListThird Party Advisory
- access.redhat.com/errata/RHSA-2026:25200
- access.redhat.com/security/cve/CVE-2026-41326
- bugzilla.redhat.com/show_bug.cgi?id=2460859
- github.com/kata-containers/kata-containers/security/advisories/… Third Party Advisory
- security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-41326…
Metrics
- CVSS 3.1
-
8.2
HIGH
Score source: NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N - CVSS 4.0
-
8.2
HIGH
Score source: CNA
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:H/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - EPSS — exploit probability
- 0% percentile: 29 · as of 13 November 2026
- CWE
- CWE-61CWE-1220
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.