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CVE-2026-41326: Kata Containers: CopyFile Policy Subversion via Symlinks

• Severity: high (CVSS 8.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-24 · updated 2026-08-24
• Weakness: CWE-61

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: from 0.9.0 before 0.20.0 — fixed in 0.20.0
• kata-containers: from 3.4.0 before 3.29.0 — fixed in 3.29.0

How to fix

Upgrade to a fixed version: Katacontainers Confidential Containers 0.20.0; kata-containers 3.29.0. Check the vendor advisory for mitigations.

References

• https://github.com/kata-containers/kata-containers/commit/1b9e49eb2763aa6ea6a99b276d3ff5e2c7f658f2
• https://github.com/kata-containers/kata-containers/security/advisories/GHSA-q49m-57vm-c8cc
• http://www.openwall.com/lists/oss-security/2026/05/13/2
• 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
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-41326.json

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