Security Digest · Vulnerability record
CVE-2026-18948: Feast vulnerable to arbitrary code execution via unsafe deserialization of dill-serialized UDFs
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.
CVSS 9.9 Critical EPSS 1.1% · p65
Should you act?
Critical, preconditions apply
Severe if exploited, but exploitation needs conditions that may not apply to you. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.
- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 1.1%, percentile 65: FIRST’s model estimates a 1.1% chance of exploitation activity in the next 30 days, higher than 65% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Needs an account (low (any account)). Exposure depends on who can log in.
- Only applies if your dependency tree includes
feast(PyPI) < 0.67.0, fixed in 0.67.0. Check your lockfile, including transitive dependencies.
What it is
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.
From the GitHub advisory
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 type: CWE-502.
Product: feast (PyPI) · Assigned by: redhat · Published: 2026-08-10
Affected and fixed versions
| Ecosystem | Package | Vulnerable | First fixed |
|---|---|---|---|
| PyPI | feast | < 0.67.0 | 0.67.0 |
| Vendor | Product | Affected versions (per CVE record) |
|---|---|---|
| Red Hat | Red Hat OpenShift AI 2.25 | see vendor advisory |
| Red Hat | Red Hat OpenShift AI 3.3 | see vendor advisory |
| Red Hat | Red Hat OpenShift AI 3.4 | see vendor advisory |
| Red Hat | Red Hat OpenShift AI 3.4 | see vendor advisory |
| Red Hat | Red Hat OpenShift AI (RHOAI) | see vendor advisory |
| Red Hat | Red Hat OpenShift AI (RHOAI) | see vendor advisory |
| Red Hat | Red Hat OpenShift AI (RHOAI) | see vendor advisory |
| Red Hat | Red Hat OpenShift AI (RHOAI) | see vendor advisory |
| Red Hat | Red Hat OpenShift AI (RHOAI) | see vendor advisory |
| Red Hat | Red Hat OpenShift AI (RHOAI) | see vendor advisory |
Severity scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| redhat | 3.1 | 9.9 Critical | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
| GitHub | 3.1 | 9.9 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
- Attack vector: network (remotely reachable)
- Attack complexity: low
- Privileges required: low (any account)
- User interaction: none
- Scope: changed (can affect other components)
CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.
Exploitation and urgency
- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none, automatable no, technical impact total.
- FIRST EPSS (model of 2026-11-04): 1.08% probability of exploitation activity in the next 30 days; percentile 65.
Timeline
- — CVE record published by redhat
- — GitHub-reviewed advisory GHSA-gg2p-37pv-v7fq published (critical)
- — CVE record last updated
Sources and references
Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.
Vendor and project advisories, patches
- RHSA-2026:53261 access.redhat.com
- RHSA-2026:53262 access.redhat.com
- RHSA-2026:53263 access.redhat.com
- RHSA-2026:60520 access.redhat.com
Vulnerability records
- GitHub Advisory GHSA-gg2p-37pv-v7fq github.com
- CVE.org record CVE-2026-18948 cve.org
- NVD entry CVE-2026-18948 nvd.nist.gov
Other references from the CVE record and advisory
- access.redhat.com access.redhat.com
- RHBZ#2511167 bugzilla.redhat.com
- github.com github.com
- github.com github.com
- github.com github.com
- github.com github.com