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Vulnerability record · CVE-2026-41326 · published 24 April 2026

CVE-2026-41326: Katacontainers confidential containers vulnerability

Katacontainers · Confidential Containers

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.

8.2 CVSS 4.0 High EPSS 0.37% · top 71.5% CWE-61 · CWE-61CWE-1220 · CWE-1220
8.2CVSS 4.0 base score
0.37%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
8References
24 Aug 2026Last modified by NVD

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.

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:

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/kata-containers/kata-containers/commit/1b9e49eb2763aa6ea6a99b276d3ff5e2c7f658f2 Patch
https://github.com/kata-containers/kata-containers/security/advisories/GHSA-q49m-57vm-c8cc Third Party Advisory
http://www.openwall.com/lists/oss-security/2026/05/13/2 Mailing ListThird Party Advisory
https://access.redhat.com/errata/RHSA-2026:25200
https://access.redhat.com/security/cve/CVE-2026-41326
https://bugzilla.redhat.com/show_bug.cgi?id=2460859
https://github.com/kata-containers/kata-containers/security/advisories/GHSA-q49m-57vm-c8cc Third Party Advisory
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-41326.json

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Source: NIST National Vulnerability Database (record CVE-2026-41326), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.