CVE-2026-56121

CRITICALPre-NVD 9.89.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-06-24. A secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Elevated
9.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 1.4%CVSS: 9.8Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

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 v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
75
EG Risk 75/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed (value × EchelonGraph’s weight)
Severity98% × 45%
The EG Score, 9.8 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low, Track* at medium and Attend at high mission impact.
Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
1.4%
EPSS %ILE
71st
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low, Track* at medium and Attend at high mission impact.

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)3 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

June 24, 2026

Last Modified

August 28, 2026

Advisory Details (8)

Auto-updated Oct 9, 2026
Patch available. Sources: github_commit, github_release, redhat.
Red Hat
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-56121.json
Red Hat

2492229 – (CVE-2026-56121) CVE-2026-56121 feast: Feast: Remote Code Execution via Unsafe Deserialization in gRPC Registry Server

https://bugzilla.redhat.com/show_bug.cgi?id=2492229
Red HatMentions a patch (unverified)

CVE-2026-56121 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-56121
Red HatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2026:60520
Web page

Feast < 0.63.0 Unauthenticated RCE via ApplyFeatureView gRPC Deserialization | Advisories | VulnCheck

https://www.vulncheck.com/advisories/feast-unauthenticated-rce-via-applyfeatureview-grpc-deserialization
Web page

huntr - The world's first bug bounty platform for AI/ML

https://huntr.com/bounties/d64b8111-180b-46ba-afa3-c877fda2ede6
GitHub release Patch Available

v0.63.0

Patch available: feast-dev/feast v0.63.0

https://github.com/feast-dev/feast/releases/tag/v0.63.0
GitHub commit

commit 835cda8e2c13 (feast-dev/feast)

Fix landed in feast-dev/feast commit 835cda8e2c13 — awaiting tagged release

https://github.com/feast-dev/feast/commit/835cda8e2c1359f1f496ad72701dbd6a73bdb25a

Vendor Advisories for CVE-2026-56121(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatrhoai/odh-workbench-jupyter-tensorflow-rocm-py312-rhel9:17870737132026-08-27redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 10× in last 7d / 43× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 477 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 377 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-11 19:38 UTCEG score recompute
  2. 2026-10-11 16:53 UTCEG score recompute
  3. 2026-10-11 14:16 UTCEG score recompute
  4. 2026-10-11 13:49 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  5. 2026-10-10 20:00 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  6. 2026-10-09 20:07 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  7. 2026-10-08 17:13 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  8. 2026-10-07 23:48 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  9. 2026-10-06 15:18 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  10. 2026-10-05 17:43 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  11. 2026-10-03 14:26 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  12. 2026-10-02 17:56 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  13. 2026-10-01 19:50 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  14. 2026-09-30 15:03 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  15. 2026-09-29 15:22 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  16. 2026-09-28 13:51 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  17. 2026-09-27 13:48 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  18. 2026-09-26 15:59 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  19. 2026-09-24 14:04 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  20. 2026-09-23 17:54 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  21. 2026-09-23 11:47 UTCEG score recompute
  22. 2026-09-23 11:47 UTCVendor advisory
  23. 2026-09-23 11:47 UTCGHSA enrichmentGHSA-q63x-9pfm-mjx4 · GitHub severity CRITICAL · GitHub CVSS 9.8
  24. 2026-09-20 20:16 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  25. 2026-09-18 19:28 UTCEPSS rescoreEPSS 1.4% · 71st percentile
Show 75 more
  1. 2026-09-18 08:09 UTCEG score recompute
  2. 2026-09-18 08:09 UTCVendor advisory
  3. 2026-09-18 08:09 UTCGHSA enrichmentGHSA-q63x-9pfm-mjx4 · GitHub severity CRITICAL · GitHub CVSS 9.8
  4. 2026-09-17 19:31 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  5. 2026-09-16 14:08 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  6. 2026-09-16 05:15 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  7. 2026-09-15 03:11 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  8. 2026-09-14 09:17 UTCVendor advisory
  9. 2026-09-14 09:17 UTCGHSA enrichmentGHSA-q63x-9pfm-mjx4 · GitHub severity CRITICAL · GitHub CVSS 9.8
  10. 2026-09-14 05:37 UTCVendor advisory
  11. 2026-09-14 05:37 UTCGHSA enrichmentGHSA-q63x-9pfm-mjx4 · GitHub severity CRITICAL · GitHub CVSS 9.8
  12. 2026-09-14 01:57 UTCEG score recompute
  13. 2026-09-14 01:57 UTCVendor advisory
  14. 2026-09-14 01:57 UTCGHSA enrichmentGHSA-q63x-9pfm-mjx4 · GitHub severity CRITICAL · GitHub CVSS 9.8
  15. 2026-09-13 16:47 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  16. 2026-09-13 12:02 UTCEG score recompute
  17. 2026-09-13 12:02 UTCVendor advisory
  18. 2026-09-13 12:01 UTCGHSA enrichmentGHSA-q63x-9pfm-mjx4 · GitHub severity CRITICAL · GitHub CVSS 9.8
  19. 2026-09-11 14:53 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  20. 2026-09-10 09:35 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  21. 2026-09-08 22:01 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  22. 2026-09-07 16:01 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  23. 2026-09-06 13:47 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  24. 2026-09-04 05:07 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  25. 2026-09-02 14:12 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  26. 2026-09-01 13:54 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  27. 2026-09-01 04:40 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  28. 2026-08-31 00:00 UTCVendor advisory
  29. 2026-08-31 00:00 UTCGHSA enrichmentGHSA-q63x-9pfm-mjx4 · GitHub severity CRITICAL · GitHub CVSS 9.8
  30. 2026-08-30 20:19 UTCEG score recompute
  31. 2026-08-30 20:19 UTCVendor advisory
  32. 2026-08-30 20:19 UTCGHSA enrichmentGHSA-q63x-9pfm-mjx4 · GitHub severity CRITICAL · GitHub CVSS 9.8
  33. 2026-08-30 19:17 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  34. 2026-08-30 01:22 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  35. 2026-08-28 21:41 UTCEPSS rescoreEPSS 1.4% · 69th percentile
  36. 2026-08-28 16:46 UTCEG score recompute
  37. 2026-08-28 16:46 UTCVendor advisory
  38. 2026-08-28 16:46 UTCGHSA enrichmentGHSA-q63x-9pfm-mjx4 · GitHub severity CRITICAL · GitHub CVSS 9.8
  39. 2026-08-28 15:58 UTCEG score recompute
  40. 2026-08-28 15:58 UTCVendor advisory
  41. 2026-08-28 15:58 UTCGHSA enrichmentGHSA-q63x-9pfm-mjx4 · GitHub severity CRITICAL · GitHub CVSS 9.8
  42. 2026-08-28 04:50 UTCEG score recompute
  43. 2026-08-28 04:50 UTCVendor advisory
  44. 2026-08-28 04:50 UTCGHSA enrichmentGHSA-q63x-9pfm-mjx4 · GitHub severity CRITICAL · GitHub CVSS 9.8
  45. 2026-08-27 14:25 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  46. 2026-08-26 14:46 UTCEPSS rescoreEPSS 1.4% · 69th percentile
  47. 2026-08-25 13:49 UTCEPSS rescoreEPSS 1.4% · 69th percentile
  48. 2026-08-25 05:23 UTCGHSA enrichmentGHSA-q63x-9pfm-mjx4 · GitHub severity CRITICAL · GitHub CVSS 9.8
  49. 2026-08-25 01:43 UTCGHSA enrichmentGHSA-q63x-9pfm-mjx4 · GitHub severity CRITICAL · GitHub CVSS 9.8
  50. 2026-08-24 22:02 UTCEG score recompute
  51. 2026-08-24 22:02 UTCGHSA enrichmentGHSA-q63x-9pfm-mjx4 · GitHub severity CRITICAL · GitHub CVSS 9.8
  52. 2026-08-24 13:46 UTCEG score recompute
  53. 2026-08-24 13:46 UTCGHSA enrichmentGHSA-q63x-9pfm-mjx4 · GitHub severity CRITICAL · GitHub CVSS 9.8
  54. 2026-08-24 04:39 UTCGHSA enrichmentGHSA-q63x-9pfm-mjx4 · GitHub severity CRITICAL · GitHub CVSS 9.8
  55. 2026-08-23 23:13 UTCGHSA enrichmentGHSA-q63x-9pfm-mjx4 · GitHub severity CRITICAL · GitHub CVSS 9.8
  56. 2026-08-23 18:53 UTCGHSA enrichmentGHSA-q63x-9pfm-mjx4 · GitHub severity CRITICAL · GitHub CVSS 9.8
  57. 2026-08-23 15:12 UTCGHSA enrichmentGHSA-q63x-9pfm-mjx4 · GitHub severity CRITICAL · GitHub CVSS 9.8
  58. 2026-08-23 11:32 UTCGHSA enrichmentGHSA-q63x-9pfm-mjx4 · GitHub severity CRITICAL · GitHub CVSS 9.8
  59. 2026-08-23 07:52 UTCGHSA enrichmentGHSA-q63x-9pfm-mjx4 · GitHub severity CRITICAL · GitHub CVSS 9.8
  60. 2026-08-23 02:39 UTCEG score recompute
  61. 2026-08-23 02:39 UTCGHSA enrichmentGHSA-q63x-9pfm-mjx4 · GitHub severity CRITICAL · GitHub CVSS 9.8
  62. 2026-08-23 00:19 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  63. 2026-08-22 22:42 UTCGHSA enrichmentGHSA-q63x-9pfm-mjx4 · GitHub severity CRITICAL · GitHub CVSS 9.8
  64. 2026-08-22 13:10 UTCGHSA enrichmentGHSA-q63x-9pfm-mjx4 · GitHub severity CRITICAL · GitHub CVSS 9.8
  65. 2026-08-22 00:50 UTCEG score recompute
  66. 2026-08-22 00:50 UTCGHSA enrichmentGHSA-q63x-9pfm-mjx4 · GitHub severity CRITICAL · GitHub CVSS 9.8
  67. 2026-08-21 23:49 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  68. 2026-08-21 21:10 UTCGHSA enrichmentGHSA-q63x-9pfm-mjx4 · GitHub severity CRITICAL · GitHub CVSS 9.8
  69. 2026-08-21 17:30 UTCGHSA enrichmentGHSA-q63x-9pfm-mjx4 · GitHub severity CRITICAL · GitHub CVSS 9.8
  70. 2026-08-21 12:54 UTCGHSA enrichmentGHSA-q63x-9pfm-mjx4 · GitHub severity CRITICAL · GitHub CVSS 9.8
  71. 2026-08-21 09:14 UTCGHSA enrichmentGHSA-q63x-9pfm-mjx4 · GitHub severity CRITICAL · GitHub CVSS 9.8
  72. 2026-08-21 05:20 UTCGHSA enrichmentGHSA-q63x-9pfm-mjx4 · GitHub severity CRITICAL · GitHub CVSS 9.8
  73. 2026-08-20 23:40 UTCEG score recompute
  74. 2026-08-20 23:40 UTCGHSA enrichmentGHSA-q63x-9pfm-mjx4 · GitHub severity CRITICAL · GitHub CVSS 9.8
  75. 2026-08-20 22:55 UTCEPSS rescoreEPSS 1.1% · 64th percentile

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-56121?
CVE-2026-56121 is a critical-severity vulnerability; its CVE record was published on June 24, 2026. 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 userdefinedfunction.body field of an OnDemandFeatureView spec is decoded from…
When was CVE-2026-56121 made public?
CVE-2026-56121 was made public on February 21, 2026: that is the date its CVE record's CNA, VulnCheck, gives for when the vulnerability was made public. The CVE record itself was published on June 24, 2026. EchelonGraph's copy of the record carries a last-modified date of August 28, 2026; the record at its source may have been updated since.
Is CVE-2026-56121 actively exploited?
CVE-2026-56121 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.4% probability of exploitation in the next 30 days (71st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-56121?
CVE-2026-56121 has a CVSS base score of 9.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-56121?
A fix for CVE-2026-56121 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-56121 are linked in the Vendor Advisories panel on this page.

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