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 — 3 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

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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
70%
KEV
Not listed

Published

June 24, 2026

Last Modified

July 15, 2026

Advisory Details (7)

Auto-updated Aug 22, 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
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.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 32× in last 7d / 201× 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 408 total refreshes for this CVE.

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

Related CVEs(same CWE)

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 July 15, 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 30.0% 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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