CVE-2026-18948Network attack vector

Remote code execution via unsafe UDF deserialization

Published Aug 10, 2026 · Updated Aug 10, 2026

Unsafe deserialization in Red Hat OpenShift AI allows remote attackers to execute code through registry-stored Feast UDFs. The feature server reconstructs dill-serialized UDF objects from the registry as executable Python objects, while the registry server deserializes them without effective authorization. Default feature-server configurations permit unauthenticated exploitation; registry-server exploitation requires authentication but enables cross-tenant data access and lateral movement.

CVSS severity9.9
Critical
EPSS probability0.74%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unsafe deserialization in Red Hat OpenShift AI allows remote attackers to execute code through registry-stored Feast UDFs. The feature server reconstructs dill-serialized UDF objects from the registry as executable Python objects, while the registry server deserializes them without effective authorization. Default feature-server configurations permit unauthenticated exploitation; registry-server exploitation requires authentication but enables cross-tenant data access and lateral movement.

The record

CVE
CVE-2026-18948
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
389 Directory Server
Product
Red Hat OpenShift AI
Classifications
CWE-502, T1059.006
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

389 Directory Server · Red Hat OpenShift AIAffected versions are unavailable in this record.

Published CVSS scores

9.9Red HatCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1059.006Python

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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