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Response snapshot Nov 3, 2026, 19:21 UTC

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VulnerabilityCVE-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.

At a glance

Exploited
Not known
Severity
9.9 Critical (CVSS 3.1)
Chance of exploitation
1.1% in the next 30 days
Sources
1 source

What to do

GitHub lists first patched versions: feast: 0.67.0. Confirm the affected range and upgrade guidance in the exact advisory.

Read GitHub-reviewed advisory GHSA-gg2p-37pv-v7fq (opens a new tab)

What happened

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.

Affected package ranges reported by GitHub: feast: < 0.67.0

Scores and how they were measured

CVSS base severity

9.9

Version 3.1As of

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Measurement source (opens a new tab)

How bad it is if exploited. Not a prediction of exploitation or proof you are exposed.

EPSS probability

1.1%

Scored Percentile 65.1%

Model and measurement source (opens a new tab)

A model's estimate of exploitation in the next 30 days, not certainty or your own risk.

Related technology

Sources

  1. Primary source

    GitHub-reviewed advisory GHSA-gg2p-37pv-v7fq (opens a new tab)

    The public advisory supplies the description, affected package/version ranges, and any listed CVSS metric. GitHub review is not local review.

    Published Checked

  2. Primary source

    GitHub public advisory API page (opens a new tab)

    The API page supplied GHSA-gg2p-37pv-v7fq, its actual identifiers, source dates, and structured metrics.

    Published Date not suppliedChecked

  3. Primary source

    FIRST measured EPSS score (opens a new tab)

    Measured EPSS probability and percentile for CVE-2026-18948, scored 2026-11-03. This is a model estimate, not proof of exposure.

    Published Checked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, November 3). Feast vulnerable to arbitrary code execution via unsafe deserialization of dill-serialized UDFs (CVE-2026-18948). https://kevwire.com/record/CVE-2026-18948

MLA

"Feast vulnerable to arbitrary code execution via unsafe deserialization of dill-serialized UDFs (CVE-2026-18948)." KEVWire, 3 Nov. 2026, kevwire.com/record/CVE-2026-18948.

Chicago

KEVWire. "Feast vulnerable to arbitrary code execution via unsafe deserialization of dill-serialized UDFs (CVE-2026-18948)." Last modified November 3, 2026. https://kevwire.com/record/CVE-2026-18948.

Evidence summary (plain text)

Feast vulnerable to arbitrary code execution via unsafe deserialization of dill-serialized UDFs (Aug 10, 2026).
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.
CVSS 9.9 (version 3.1; evidence as of Nov 3, 2026; https://github.com/advisories/GHSA-gg2p-37pv-v7fq).
EPSS 1.1% for the following 30 days, scored Nov 3, 2026 (https://api.first.org/data/v1/epss?cve=CVE-2026-18948&date=2026-11-03).
Sources:
GitHub-reviewed advisory GHSA-gg2p-37pv-v7fq: https://github.com/advisories/GHSA-gg2p-37pv-v7fq
GitHub public advisory API page: https://api.github.com/advisories?type=reviewed&per_page=100&sort=updated&direction=desc
FIRST measured EPSS score: https://api.first.org/data/v1/epss?cve=CVE-2026-18948&date=2026-11-03
Record ID: CVE-2026-18948.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Not assessed.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
About this data

This record was ingested from a data source. Retrieved: Nov 3, 2026, 17:36 UTC. Ingestion is not an independent editorial investigation.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

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Record details

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