Feast: feast: unsafe dill deserialization of registry-stored udfs — rce on feature server and registry server
Summary
| CVE | CVE-2026-18948 |
|---|---|
| State | PUBLISHED |
| Assigner | redhat |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-08-10 21:17:21 UTC |
| Updated | 2026-08-11 05:17:13 UTC |
| Description | A flaw was found in Feast. The system improperly deserializes user-defined functions (UDFs) stored in its registry, which are serialized using the 'dill' library. This allows a remote attacker to store a malicious UDF, leading to unauthenticated arbitrary code execution on the feature server in default configurations. An authenticated attacker can also achieve arbitrary code execution on the registry server by bypassing authorization checks during deserialization. This vulnerability can result in cross-tenant data access and lateral movement within the system. |
Risk And Classification
Primary CVSS: v3.1 9.9 CRITICAL from [email protected]
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Secondary | 9.9 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
| 3.1 | CNA | CVSS | 9.9 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
LowUser Interaction
NoneScope
ChangedConfidentiality
HighIntegrity
HighAvailability
HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Red Hat | Red Hat OpenShift AI 3.3 | unaffected 1786110033 * rpm | Not specified |
| CNA | Red Hat | Red Hat OpenShift AI RHOAI | Not specified | Not specified |
| CNA | Red Hat | Red Hat OpenShift AI RHOAI | Not specified | Not specified |
| CNA | Red Hat | Red Hat OpenShift AI RHOAI | Not specified | Not specified |
| CNA | Red Hat | Red Hat OpenShift AI RHOAI | Not specified | Not specified |
| CNA | Red Hat | Red Hat OpenShift AI RHOAI | Not specified | Not specified |
| CNA | Red Hat | Red Hat OpenShift AI RHOAI | Not specified | Not specified |
| CNA | Red Hat | Red Hat OpenShift AI RHOAI | Not specified | Not specified |
| CNA | Red Hat | Red Hat OpenShift AI RHOAI | Not specified | Not specified |
| CNA | Red Hat | Red Hat OpenShift AI RHOAI | Not specified | Not specified |
| CNA | Red Hat | Red Hat OpenShift AI RHOAI | Not specified | Not specified |
| CNA | Red Hat | Red Hat OpenShift AI RHOAI | Not specified | Not specified |
| CNA | Red Hat | Red Hat OpenShift AI RHOAI | Not specified | Not specified |
| CNA | Red Hat | Red Hat OpenShift AI RHOAI | Not specified | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| bugzilla.redhat.com/show_bug.cgi | [email protected] | bugzilla.redhat.com | |
| access.redhat.com/security/cve/CVE-2026-18948 | [email protected] | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:53263 | [email protected] | access.redhat.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| CNA | 2026-08-04T18:13:43.552Z | Reported to Red Hat. |
| CNA | 2026-08-10T18:52:57.732Z | Made public. |
Workarounds
CNA: Configure Feast to enforce `auth.type: kubernetes` in the operator-generated configuration and deny registry writes by default. This measure limits the attack surface by requiring proper authentication and authorization for registry modifications, preventing the deserialization of malicious user-defined functions.
There are currently no legacy QID mappings associated with this CVE.