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CVE-2026-41326

Kata Containers: CopyFile Policy Subversion via Symlinks

HIGH
8.2
CVSS Score
Published: April 24, 2026 at 06:46 PM UTC
Updated: August 24, 2026 at 01:18 PM UTC
4 products affected across 2 vendorsKata ContainersConfidential ContainersOpenShift Container Platform

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Severity
HIGH8.2
Exploit prediction
EPSS 0.3%
SSVC
PoC

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Confidential Containers· Katacontainers
95%
0.9.0 ≤ v < 0.20.0
Affected range stops below 0.20.0, so it looks safe — our inference, not a vendor statement
Kata Containers· Katacontainers
95%
v < 3.29.03.4.0 ≤ v < 3.29.0
Affected range stops below 3.29.0, so it looks safe — our inference, not a vendor statement
Confidential Compute Attestation· Red Hatrpm
60%
All versions
OpenShift Container Platform· Red Hatcontainer
60%
4
Vendor states this is fixed in 4 (unaffected)
Vendor states this is fixed in 4.19.9.6.202606100451-0 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (7)

x_refsource_CONFIRMThird Party Advisory
Source: [email protected]
https://github.com/kata-containers/kata-containers/security/advisories/GHSA-q49m-57vm-c8cc
x_refsource_MISCPatch
Source: cverecord
https://github.com/kata-containers/kata-containers/commit/1b9e49eb2763aa6ea6a99b276d3ff5e2c7f658f2
Mailing ListThird Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
http://www.openwall.com/lists/oss-security/2026/05/13/2
Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:25200
Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/security/cve/CVE-2026-41326
Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://bugzilla.redhat.com/show_bug.cgi?id=2460859
Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-41326.json

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.2HIGHGitHub_M
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-61CWE-1220

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