CVE-2026-18948 Feast: feast: unsafe dill deserialization of registry-stored udfs — rce on feature server and registry server
Remote attackers can execute arbitrary code on Feast feature and registry servers via unsafe dill deserialization of stored UDFs.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-18948?
CVE-2026-18948 is a critical unsafe deserialization vulnerability in Red Hat OpenShift AI (RHOAI), published on 10 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-502
Which versions are affected by CVE-2026-18948?
How do I fix CVE-2026-18948?
No fix has been published for CVE-2026-18948 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-18948 being exploited?
There is no known exploitation of CVE-2026-18948 in the wild and no public exploit code.
Sources
Also known as GHSA-gg2p-37pv-v7fq.