Trending
CVE-2026-56121

CVE detail

CVE-2026-56121

Feast before 0.63.0 contains an unsafe deserialization vulnerability that allows unauthenticated or unauthorized attackers to achieve remote code execution by sending a crafted gRPC request to the registry server. The user_defined_function.body field of an OnDemandFeatureView spec is decoded from base64 and passed to dill.loads() before any authorization check is performed, enabling attackers to embed a malicious serialized Python object with an arbitrary __reduce__ method to execute OS commands as the feast service account.

CVSS 9.3 · CriticalBuzz score 41.71 public exploit repository references

Buzz score

Why this CVE is surfacing

Buzz score total 41.7

This all-time snapshot uses the same composite formula as Trending across a 30-year evidence window, rather than a current rolling window.

Buzz score components · mention 20.8 · diversity 16.0 · KEV 0.0 · OTX 0.0 · PoC 5.0

Mention score

20.8

7 evidence mentions in the snapshot

Diversity score

16.0

6 sources across 2 categories

KEV score

0.0

No KEV entry observed

OTX score

0.0

0 OTX pulses

PoC score

5.0

1 repos · best confidence 0.99

Best PoC traction

Maximum stars on a matched PoC repo

Why it matters now

Mention timeline

Total mentions: 0; within the 30d window
Peak daily: 0; highest bucket

Evidence

Source links by recency

Newest mentions first

7 source links · newest first

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-56121.jsonsecurity.access.redhat.com
No excerpt available.
Vendor Advisorysecurity.access.redhat.comJun 24, 2026, 4:16 PM
https://bugzilla.redhat.com/show_bug.cgi?id=2492229bugzilla.redhat.com
No excerpt available.
Exploitbugzilla.redhat.comJun 24, 2026, 4:16 PM
https://access.redhat.com/security/cve/CVE-2026-56121access.redhat.com
No excerpt available.
Vendor Advisoryaccess.redhat.comJun 24, 2026, 4:16 PM
https://www.vulncheck.com/advisories/feast-unauthenticated-rce-via-applyfeatureview-grpc-deserializationwww.vulncheck.com
No excerpt available.
Exploitwww.vulncheck.comJun 24, 2026, 4:16 PM
https://huntr.com/bounties/d64b8111-180b-46ba-afa3-c877fda2ede6huntr.com
No excerpt available.
Exploithuntr.comJun 24, 2026, 4:16 PM
https://github.com/feast-dev/feast/releases/tag/v0.63.0github.com
No excerpt available.
Exploitgithub.comJun 24, 2026, 4:16 PM
https://github.com/feast-dev/feast/commit/835cda8e2c1359f1f496ad72701dbd6a73bdb25agithub.com
No excerpt available.
Exploitgithub.comJun 24, 2026, 4:16 PM

Exploit code

Public exploit repository references

Public PoC repositories are third-party, potentially unsafe artifacts. Treat their code as untrusted and use it only on authorized systems in an isolated, least-privilege environment. cvebuzz does not execute the code or verify that an exploit works.

1 repository references · best confidence 0.99 · max 0 stars

BiiTts/CVE-2026-56121-Feast-Unauth-RCEHigh confidence
githubDiscovery source unavailable0 starsDiscovered Jul 9, 2026, 1:19 AM

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External lookup

Potential internet exposure

Potential exposure only — not proof of vulnerability.Shodan results indicate potentially internet-exposed products, not confirmed vulnerable systems. They do not confirm that any returned system is vulnerable to CVE-2026-56121.

Product-level CPE searches intentionally omit version fields and NVD version-range or configuration certainty. Verify the exact product version and configuration independently.

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Product CPE queries

Derived from this CVE's existing NVD CPE 2.3 records; the application, operating-system, or hardware part is retained.

Product query unavailableNo valid raw CPE 2.3 product record is available for this CVE, so no product-level Shodan query is shown.

Exact CVE query

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vuln:CVE-2026-56121Search this CVE on Shodan

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Metadata

Canonical fields

NVD status

Deferred

Published

Jun 24, 2026

Modified

Jul 15, 2026

Official record

Authoritative NVD record

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CWE IDs

Vendor classifications

Unavailable

How this vector reads

CVSS 4.0 base metrics decoded below. This explanation does not recalculate or change the NVD score.

Attack Vector (AV): Network. The vulnerable system can be reached across network boundaries.
Attack Complexity (AC): Low. No special conditions beyond the attacker-controlled steps are required.
Attack Requirements (AT): None. No prerequisite deployment or execution condition is required.
Privileges Required (PR): None. The attacker needs no privileges on the vulnerable system.
User Interaction (UI): None. Exploitation does not require a targeted user to act.
Vulnerable System Confidentiality (VC): High. There is a total or serious impact to this security property.
Vulnerable System Integrity (VI): High. There is a total or serious impact to this security property.
Vulnerable System Availability (VA): High. There is a total or serious impact to this security property.
Subsequent System Confidentiality (SC): None. There is no direct impact to this security property.
Subsequent System Integrity (SI): None. There is no direct impact to this security property.
Subsequent System Availability (SA): None. There is no direct impact to this security property.

Optional CVSS v4 metrics remain in the raw vector; only base metrics are expanded here.

Signals

Exploitation indicators

0 stored signals · no KEV · 0 OTX pulses