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
63%
KEV
Not listed

Published

June 24, 2026

Last Modified

July 15, 2026

Advisory Details (7)

Auto-updated Jul 25, 2026
Patch available. Sources: github_release, redhat, github_commit.
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-details

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 Patch Available

commit 835cda8e2c13 (feast-dev/feast)

Patch available: feast-dev/feast v0.63.0 (contains commit 835cda8e2c13)

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

Vendor Advisories for CVE-2026-56121(1)

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 15× in last 7d / 178× 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 199 total refreshes for this CVE.

  1. 2026-07-27 10:07 UTCGHSA enrichment
  2. 2026-07-27 06:27 UTCGHSA enrichment
  3. 2026-07-27 02:46 UTCGHSA enrichment
  4. 2026-07-26 23:05 UTCGHSA enrichment
  5. 2026-07-26 19:24 UTCGHSA enrichment
  6. 2026-07-26 15:42 UTCEG score recompute
  7. 2026-07-26 15:42 UTCGHSA enrichment
  8. 2026-07-26 14:54 UTCEPSS rescore
  9. 2026-07-25 14:18 UTCEPSS rescore
  10. 2026-07-24 14:18 UTCEPSS rescore
  11. 2026-07-23 14:18 UTCEPSS rescore
  12. 2026-07-23 03:20 UTCEG score recompute
  13. 2026-07-22 14:08 UTCEPSS rescore
  14. 2026-07-21 15:25 UTCEPSS rescore
  15. 2026-07-20 17:08 UTCEPSS rescore
  16. 2026-07-19 14:31 UTCEPSS rescore
  17. 2026-07-19 14:31 UTCEPSS rescore
  18. 2026-07-19 02:29 UTCEPSS rescore
  19. 2026-07-18 10:04 UTCEPSS rescore
  20. 2026-07-17 06:23 UTCGHSA enrichment
  21. 2026-07-17 02:42 UTCGHSA enrichment
  22. 2026-07-16 22:26 UTCGHSA enrichment
  23. 2026-07-16 18:46 UTCGHSA enrichment
  24. 2026-07-16 17:03 UTCEPSS rescore
  25. 2026-07-16 15:05 UTCGHSA enrichment
Show 75 more
  1. 2026-07-16 11:09 UTCGHSA enrichment
  2. 2026-07-16 06:58 UTCGHSA enrichment
  3. 2026-07-16 02:46 UTCGHSA enrichment
  4. 2026-07-15 23:05 UTCGHSA enrichment
  5. 2026-07-15 19:22 UTCGHSA enrichment
  6. 2026-07-15 16:57 UTCEPSS rescore
  7. 2026-07-15 16:57 UTCEPSS rescore
  8. 2026-07-15 15:41 UTCGHSA enrichment
  9. 2026-07-15 12:01 UTCGHSA enrichment
  10. 2026-07-15 07:03 UTCGHSA enrichment
  11. 2026-07-15 03:23 UTCGHSA enrichment
  12. 2026-07-15 02:00 UTCEPSS rescore
  13. 2026-07-15 02:00 UTCEPSS rescore
  14. 2026-07-14 23:41 UTCGHSA enrichment
  15. 2026-07-14 19:55 UTCGHSA enrichment
  16. 2026-07-14 16:15 UTCGHSA enrichment
  17. 2026-07-14 12:35 UTCGHSA enrichment
  18. 2026-07-14 08:55 UTCGHSA enrichment
  19. 2026-07-14 05:15 UTCGHSA enrichment
  20. 2026-07-14 01:34 UTCGHSA enrichment
  21. 2026-07-13 22:31 UTCEPSS rescore
  22. 2026-07-13 21:54 UTCGHSA enrichment
  23. 2026-07-13 18:12 UTCGHSA enrichment
  24. 2026-07-13 14:30 UTCGHSA enrichment
  25. 2026-07-13 10:49 UTCGHSA enrichment
  26. 2026-07-13 07:08 UTCGHSA enrichment
  27. 2026-07-13 06:13 UTCEPSS rescore
  28. 2026-07-13 06:13 UTCEPSS rescore
  29. 2026-07-13 03:27 UTCGHSA enrichment
  30. 2026-07-12 23:46 UTCGHSA enrichment
  31. 2026-07-12 20:05 UTCGHSA enrichment
  32. 2026-07-12 16:24 UTCGHSA enrichment
  33. 2026-07-12 12:44 UTCGHSA enrichment
  34. 2026-07-12 09:03 UTCGHSA enrichment
  35. 2026-07-12 05:46 UTCEPSS rescore
  36. 2026-07-12 05:22 UTCGHSA enrichment
  37. 2026-07-12 01:42 UTCGHSA enrichment
  38. 2026-07-11 22:01 UTCGHSA enrichment
  39. 2026-07-11 18:21 UTCGHSA enrichment
  40. 2026-07-11 14:41 UTCGHSA enrichment
  41. 2026-07-11 11:00 UTCGHSA enrichment
  42. 2026-07-11 08:27 UTCEPSS rescore
  43. 2026-07-11 08:27 UTCEPSS rescore
  44. 2026-07-11 07:20 UTCGHSA enrichment
  45. 2026-07-11 03:38 UTCGHSA enrichment
  46. 2026-07-10 23:57 UTCGHSA enrichment
  47. 2026-07-10 20:17 UTCGHSA enrichment
  48. 2026-07-10 16:37 UTCGHSA enrichment
  49. 2026-07-10 12:53 UTCGHSA enrichment
  50. 2026-07-10 09:13 UTCGHSA enrichment
  51. 2026-07-10 05:31 UTCGHSA enrichment
  52. 2026-07-10 01:51 UTCGHSA enrichment
  53. 2026-07-09 22:10 UTCGHSA enrichment
  54. 2026-07-09 19:10 UTCEPSS rescore
  55. 2026-07-09 19:10 UTCEPSS rescore
  56. 2026-07-09 18:26 UTCGHSA enrichment
  57. 2026-07-09 14:45 UTCGHSA enrichment
  58. 2026-07-09 10:50 UTCGHSA enrichment
  59. 2026-07-09 07:07 UTCGHSA enrichment
  60. 2026-07-09 03:25 UTCGHSA enrichment
  61. 2026-07-08 23:35 UTCGHSA enrichment
  62. 2026-07-08 19:55 UTCGHSA enrichment
  63. 2026-07-08 16:12 UTCGHSA enrichment
  64. 2026-07-08 15:16 UTCEPSS rescore
  65. 2026-07-08 15:16 UTCEPSS rescore
  66. 2026-07-08 12:32 UTCGHSA enrichment
  67. 2026-07-08 08:42 UTCGHSA enrichment
  68. 2026-07-08 04:57 UTCGHSA enrichment
  69. 2026-07-08 01:16 UTCGHSA enrichment
  70. 2026-07-07 21:35 UTCGHSA enrichment
  71. 2026-07-07 17:55 UTCGHSA enrichment
  72. 2026-07-07 13:46 UTCEPSS rescore
  73. 2026-07-07 13:46 UTCEPSS rescore
  74. 2026-07-07 13:34 UTCGHSA enrichment
  75. 2026-07-07 09:54 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 36.6% 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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