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Full vulnerability report · 2026
CVE-2026-18948High confidence

Feast: feast: unsafe dill deserialization of registry-stored udfs — rce on feature server and registry server

Red Hat · Red Hat OpenShift AI 2.25

Official source article: Red Hat RHSA-2026:53261 ↗. Check the applicable product and release in the original source.

9.9CriticalCVSS 3.1
Recommended action
Within 7 days

Critical technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityCriticalOperational priority:Critical, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • EPSS is 1.08% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict the affected network interface to trusted sources where business-safe.
  • Monitor vendor guidance and exploitation sources for a material change.

Verification

  1. Confirm that the asset runs Red Hat Red Hat OpenShift AI 2.25 and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: Within 3 daysRemediation target: Within 90 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

1 current
CVE-2026-18948 · CSAF 2.0 · revision 3 · finalRed Hat Product Securityfeast: Feast: Unsafe dill deserialization of registry-stored UDFs — RCE on feature server and registry server
12 fixed

The vendor explicitly identifies these products or versions as containing the fix.

  • registry.redhat.io/rhoai/odh-feature-server-rhel9@sha256:c4ed94d9d45d8682a87f68845dff96892a45fa0e2cc84341986e2a7f58303655_ppc64le as a component of Red Hat OpenShift AI 2.25
  • registry.redhat.io/rhoai/odh-feature-server-rhel9@sha256:ec80a875d9ee27568b4c171d430ad0974a4c6d823cf8ee25fad291fc4975bb33_amd64 as a component of Red Hat OpenShift AI 2.25
  • registry.redhat.io/rhoai/odh-feature-server-rhel9@sha256:fca8e754f4e521f7e86a8bcd0c4a513511850ec78471a96f92757cad5bcb8c6d_arm64 as a component of Red Hat OpenShift AI 2.25
  • registry.redhat.io/rhoai/odh-feature-server-rhel9@sha256:5ae49aa23a8060a23d0d811d6ba936d450d273a6ba2cd260e1bbb85ae47a9f84_ppc64le as a component of Red Hat OpenShift AI 3.3
  • registry.redhat.io/rhoai/odh-feature-server-rhel9@sha256:d3e4c25c477d80f3e861d6b04a10d1f9869c093a5c6ec0666c8d66d237ebe36c_arm64 as a component of Red Hat OpenShift AI 3.3
  • registry.redhat.io/rhoai/odh-feature-server-rhel9@sha256:df14db5d20c76ec58ec9561940a2c29052d033dc5fd6a3d3872a5da75bbb12b4_amd64 as a component of Red Hat OpenShift AI 3.3
  • registry.redhat.io/rhoai/odh-feature-server-rhel9@sha256:6202cb98639928b66dc7fc6663ad0322973b11826799e77691d7756c5ccb8f31_ppc64le as a component of Red Hat OpenShift AI 3.4
  • registry.redhat.io/rhoai/odh-feature-server-rhel9@sha256:73753182103388f0ef39a228be68320855a08475920fcf70527acc391b60a351_ppc64le as a component of Red Hat OpenShift AI 3.4
  • registry.redhat.io/rhoai/odh-feature-server-rhel9@sha256:9b617a6d6e3428af61f3454aa5f4207fd00016559dfc88ba450f02e3c65207ef_arm64 as a component of Red Hat OpenShift AI 3.4
  • registry.redhat.io/rhoai/odh-feature-server-rhel9@sha256:bf39e97b5a9cac6107ef760d10782a4f017954e3d3650bbecfeec96b217ced74_amd64 as a component of Red Hat OpenShift AI 3.4
  • registry.redhat.io/rhoai/odh-feature-server-rhel9@sha256:c47f990eda9a49490c89d23f5e8ad0e9e394de95247d389c106d27b48a64240e_arm64 as a component of Red Hat OpenShift AI 3.4
  • registry.redhat.io/rhoai/odh-feature-server-rhel9@sha256:c5dd868cd66e7911969f60658d31b3714ed42f0e81b9512f89991a412bcb0fa9_amd64 as a component of Red Hat OpenShift AI 3.4
Summary
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.
Remediation
For Red Hat OpenShift AI 2.25.10 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this errata update: https://docs.redhat.com/en/documentation/red_hat_openshift_ai/
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2026-55818

No EUVD known-exploited evidence

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.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
9.9 · CVSS 3.1
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 7 days

Critical technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
01

What, why and how

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.

What

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.

Why

Attacker-influenced serialised data is reconstructed as trusted objects, which can invoke dangerous application behaviour.

How

An attacker operating through a network path may attempt exploitation with low privileges. If successful, the issue may execute code or commands in the affected security context.

What

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.

Why

Attacker-influenced serialised data is reconstructed as trusted objects, which can invoke dangerous application behaviour.

How

An attacker operating through a network path may attempt exploitation with low privileges. If successful, the issue may execute code or commands in the affected security context.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
a network path → Deserialization of Untrusted Data → execute code or commands in the affected security context
Attack surface
Network
Privileges required
Low: a basic authenticated account is required
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Changed: exploitation can affect a different security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-502 ↗

CWE-502: Deserialization of Untrusted Data. The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRLowPrivileges required: The attacker needs basic user-level privileges.UINoneUser interaction: No action by another user is required.SChangedScope: The attack can affect a component governed by a different security authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
After compromise, an attacker may use built-in shells, scripting engines, scheduled tasks and native network utilities for discovery, persistence or movement. This is a plausible LoTL path, not evidence that it has occurred for every attack.
NetworkRemote code executionCWE-502
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2026-55818Official EUVD mapping

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.

Official EUVD record ↗
BSI · German · WID-SEC-2026-2750Red Hat OpenShift: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Red Hat OpenShift ausnutzen, um beliebigen Programmcode auszuführen, um seine Privilegien zu erhöhen, um einen Denial of Service Angriff durchzuführen, um Informationen offenzulegen, und um Dateien zu manipulieren.

Official advisory ↗
Cyber Security Agency of Singapore · English · CSA-SB-20260812Security Bulletin 12 Aug 2026

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 12 Aug 2026, published on 12 August 2026. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
Fixed
Action
For Red Hat OpenShift AI 2.25.10 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this errata update: https://docs.redhat.com/en/documentation/red_hat_openshift_ai/
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 10 Aug 2026 · Last source change 28 Sept 2026, 09:48 UTC · CWE-502 · Deserialization of Untrusted Data

CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2026-55818
Product sourceCNA
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD awaiting enrichment

Missing structured fields: affected versions. Missing data is not evidence of low risk; review the primary advisory.

Material change intelligence

What changed after publication

View recent updates ↗
  1. Affected versionsThe structured affected or fixed version information changed.
    Before
    See the vendor and CVE records for the affected range. · Fixed: 1786110051 < *; 1786110033 < *; 1786107278 < *; 1787068065 < *
    After
    See the vendor and CVE records for the affected range. · Fixed: Red Hat OpenShift AI 2.25: 1786110051 < *; Red Hat OpenShift AI 3.3: 1786110033 < *; Red Hat OpenShift AI 3.4: 1786107278 < *, 1787068065 < *
    CNA ↗
  2. Affected versionsThe structured affected or fixed version information changed.
    Before
    See the vendor and CVE records for the affected range. · Fixed: 1786110051 < *; 1786110033 < *; 1786107278 < *
    After
    See the vendor and CVE records for the affected range. · Fixed: 1786110051 < *; 1786110033 < *; 1786107278 < *; 1787068065 < *
    CNA ↗
  3. Affected versionsThe structured affected or fixed version information changed.
    Before
    Fixed: registry.redhat.io/rhoai/odh-feature-server-rhel9@sha256:c4ed94d9d45d8682a87f68845dff96892a45fa0e2cc84341986e2a7f58303655_ppc64le as a component of Red Hat OpenShift AI 2.25; registry.redhat.io/rhoai/odh-feature-server-rhel9@sha256:ec80a875d9ee27568b4c171d430ad0974a4c6d823cf8ee25fad291fc4975bb33_amd64 as a component of Red Hat OpenShift AI 2.25; registry.redhat.io/rhoai/odh-feature-server-rhel9@sha256:fca8e754f4e521f7e86a8bcd0c4a513511850ec78471a96f92757cad5bcb8c6d_arm64 as a component of Red Hat OpenShift AI 2.25; registry.redhat.io/rhoai/odh-feature-server-rhel9@sha256:5ae49aa23a8060a23d0d811d6ba936d450d273a6ba2cd260e1bbb85ae47a9f84_ppc64le as a component of Red Hat OpenShift AI 3.3; registry.redhat.io/rhoai/odh-feature-server-rhel9@sha256:d3e4c25c477d80f3e861d6b04a10d1f9869c093a5c6ec0666c8d66d237ebe36c_arm64 as a component of Red Hat OpenShift AI 3.3; registry.redhat.io/rhoai/odh-feature-server-rhel9@sha256:df14db5d20c76ec58ec9561940a2c29052d033dc5fd6a3d3872a5da75bbb12b4_amd64 as a component of Red Hat OpenShift AI 3.3; registry.redhat.io/rhoai/odh-feature-server-rhel9@sha256:6202cb98639928b66dc7fc6663ad0322973b11826799e77691d7756c5ccb8f31_ppc64le as a component of Red Hat OpenShift AI 3.4; registry.redhat.io/rhoai/odh-feature-server-rhel9@sha256:9b617a6d6e3428af61f3454aa5f4207fd00016559dfc88ba450f02e3c65207ef_arm64 as a component of Red Hat OpenShift AI 3.4; registry.redhat.io/rhoai/odh-feature-server-rhel9@sha256:bf39e97b5a9cac6107ef760d10782a4f017954e3d3650bbecfeec96b217ced74_amd64 as a component of Red Hat OpenShift AI 3.4
    After
    Fixed: registry.redhat.io/rhoai/odh-feature-server-rhel9@sha256:c4ed94d9d45d8682a87f68845dff96892a45fa0e2cc84341986e2a7f58303655_ppc64le as a component of Red Hat OpenShift AI 2.25; registry.redhat.io/rhoai/odh-feature-server-rhel9@sha256:ec80a875d9ee27568b4c171d430ad0974a4c6d823cf8ee25fad291fc4975bb33_amd64 as a component of Red Hat OpenShift AI 2.25; registry.redhat.io/rhoai/odh-feature-server-rhel9@sha256:fca8e754f4e521f7e86a8bcd0c4a513511850ec78471a96f92757cad5bcb8c6d_arm64 as a component of Red Hat OpenShift AI 2.25; registry.redhat.io/rhoai/odh-feature-server-rhel9@sha256:5ae49aa23a8060a23d0d811d6ba936d450d273a6ba2cd260e1bbb85ae47a9f84_ppc64le as a component of Red Hat OpenShift AI 3.3; registry.redhat.io/rhoai/odh-feature-server-rhel9@sha256:d3e4c25c477d80f3e861d6b04a10d1f9869c093a5c6ec0666c8d66d237ebe36c_arm64 as a component of Red Hat OpenShift AI 3.3; registry.redhat.io/rhoai/odh-feature-server-rhel9@sha256:df14db5d20c76ec58ec9561940a2c29052d033dc5fd6a3d3872a5da75bbb12b4_amd64 as a component of Red Hat OpenShift AI 3.3; registry.redhat.io/rhoai/odh-feature-server-rhel9@sha256:6202cb98639928b66dc7fc6663ad0322973b11826799e77691d7756c5ccb8f31_ppc64le as a component of Red Hat OpenShift AI 3.4; registry.redhat.io/rhoai/odh-feature-server-rhel9@sha256:73753182103388f0ef39a228be68320855a08475920fcf70527acc391b60a351_ppc64le as a component of Red Hat OpenShift AI 3.4; registry.redhat.io/rhoai/odh-feature-server-rhel9@sha256:9b617a6d6e3428af61f3454aa5f4207fd00016559dfc88ba450f02e3c65207ef_arm64 as a component of Red Hat OpenShift AI 3.4; registry.redhat.io/rhoai/odh-feature-server-rhel9@sha256:bf39e97b5a9cac6107ef760d10782a4f017954e3d3650bbecfeec96b217ced74_amd64 as a component of Red Hat OpenShift AI 3.4; registry.redhat.io/rhoai/odh-feature-server-rhel9@sha256:c47f990eda9a49490c89d23f5e8ad0e9e394de95247d389c106d27b48a64240e_arm64 as a component of Red Hat OpenShift AI 3.4; registry.redhat.io/rhoai/odh-feature-server-rhel9@sha256:c5dd868cd66e7911969f60658d31b3714ed42f0e81b9512f89991a412bcb0fa9_amd64 as a component of Red Hat OpenShift AI 3.4
    Red Hat Product Security ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2026-55818↗Vendor CSAF · Red Hat Product Security↗CVE authority or vendor reference · Red Hat RHSA-2026:53261↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2026-18948 · cve.blacktree.nl