# 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.

- **Severity:** Critical 9.9 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 10 Aug 2026
- **Updated:** 28 Sep 2026
- **Also known as:** GHSA-gg2p-37pv-v7fq

## 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 (Deserialization of Untrusted Data)

## 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.

## Is CVE-2026-18948 being exploited?

There is no known exploitation of CVE-2026-18948 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-18948 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-18948 in the wild and no public exploit code.

Affected product: Red Hat OpenShift AI (RHOAI). No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-18948/ (Markdown: https://insights.sbomify.com/CVE-2026-18948/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-18948
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-18948
- OSV: https://osv.dev/vulnerability/CVE-2026-18948

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-18948/
Summaries are generated and may contain mistakes; the official description above is the record.