CVE-2026-56121

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

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, ghsa, secondary
Trending — 4 sources updated this weekElevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: Elevated riskExposed: 0

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
9.8(medium)
EG Risk
75(Attend)
EG Risk 75/100SSVC: Attend

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
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
71%
KEV
Not listed

Published

June 24, 2026

Last Modified

August 28, 2026

Advisory Details (8)

Auto-updated Sep 18, 2026
Patch available. Sources: github_commit, github_release, redhat.
redhat
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-56121.json
redhat

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
redhat Patch Available

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
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:60520
generic

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

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

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 / EcosystemFixed in / 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 19× in last 7d / 79× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

Showing the most recent 100 of 453 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-56121?
CVE-2026-56121 is a critical vulnerability 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 disclosed?
CVE-2026-56121 was first published in the National Vulnerability Database on June 24, 2026, with the most recent update on August 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56121 actively exploited?
CVE-2026-56121 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 28.6% of all scored CVEs.
What is the CVSS score of CVE-2026-56121?
CVE-2026-56121 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-56121?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56121, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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