CVE-2026-41326

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.

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CVSS v3.1 Score

8.2

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

EPSS — Exploit Prediction

0.0005

Probability of exploitation

0.17%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-61 CWE-61

Affected Products

Vendor	Product	Versions
katacontainers	confidential_containers	0.9.0 — 0.20.0
katacontainers	kata_containers	3.4.0 — 3.29.0

References

Advisories & Patches

https://github.com/kata-containers/kata-containers/commit/1b9e49eb2763aa6ea6a99b276d3ff5e2c7f658f2

Other References

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://github.com/kata-containers/kata-containers/security/advisories/GHSA-q49m-57vm-c8cc

Frequently Asked Questions

What is CVE-2026-41326? +

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. It has a CVSS v3.1 base score of 8.2 (HIGH).

How severe is CVE-2026-41326? +

CVE-2026-41326 has a CVSS v3.1 score of 8.2 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0005, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-41326? +

CVE-2026-41326 affects products from katacontainers, specifically: confidential_containers, kata_containers. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-41326? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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