CVE-2026-41326
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.35%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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
- 8.2 HIGHCVSS: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/M
- EPSS
- 0.35% probability · 28th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-61, CWE-1220
- Affected
- katacontainers/confidential containers · katacontainers/kata containers
- Source
- security-advisories@github.com
References
- https://github.com/kata-containers/kata-containers/commit/1b9e49eb2763aa6ea6a99b276d3ff5e2c7f658f2Patch
- https://github.com/kata-containers/kata-containers/security/advisories/GHSA-q49m-57vm-c8ccThird Party Advisory
- http://www.openwall.com/lists/oss-security/2026/05/13/2Mailing List, Third 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-c8ccThird Party Advisory
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-41326.json
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.