CVE-2026-56121

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH 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 week
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.8Exploit: NoneExposed: 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(high)
EPSS
54.2%
KEV
Not listed

Published

June 24, 2026

Last Modified

June 30, 2026

Advisory Details (7)

Auto-updated Jun 30, 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-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 100× in last 7d / 179× 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 179 total refreshes for this CVE.

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

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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 June 30, 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 54.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
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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