CVE-2026-50566
CWE-250Published: June 10, 2026· Updated: Jun 17, 2026
Official Description
Fission is an open-source, Kubernetes-native serverless framework that simplifies the deployment of functions and applications on Kubernetes. Prior to version 1.24.0, a tenant with environments.fission.io create/update RBAC can run privileged / allowPrivilegeEscalation / dangerous-capability containers in the Fission function or builder namespace, scheduled under the executor's high-privilege service account — enabling container-sandbox escape, host filesystem and network access, and potential node- and cluster-level compromise. This issue has been patched in version 1.24.0.
Risk Analysis
This critical vulnerability in Fission, a Kubernetes-native serverless framework, allows a tenant with specific RBAC permissions to run highly privileged containers. With a CVSS score of 9.9, this flaw presents an extremely high risk, potentially leading to container-sandbox escape, host filesystem and network access, and even node or cluster compromise. The lack of an EPSS score means the exploitation likelihood is currently unknown, but the severity is critical.
No public exploit is currently known for this vulnerability. The flaw is remotely exploitable (AV:N) with low attack complexity, meaning an attacker could potentially exploit it over a network if an exploit becomes available.
Upgrade Fission to version 1.24.0 or later to patch this vulnerability. Review and restrict RBAC permissions for tenants to prevent the creation or update of environments that allow privileged containers.
Technical Analysis
CVE-2026-50566 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.9.
The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.
CVSS v3.1 Vector Breakdown
Affected Vendors & Products
Exploit & PoC Resources
All References (3)
Quick Facts
Related CVEs (CWE-250)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2026-50566 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts