CVE-2026-46385

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.6%, top 52% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Elevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.9%CVSS: 7.5Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

iskorotkov/avro is a fast Go Avro codec. Prior to 2.33.0, the Avro array and map decoders looped over an attacker-controlled block-count value without checking the underlying reader's error state inside the loop body. Reader.ReadBlockHeader returns the count as a Go int, which is 64-bit on amd64 / arm64 targets — so a producer can declare a block of up to math.MaxInt64 (~9.2 × 10¹⁸) elements followed by EOF (or any truncated payload), and the decoder will attempt that many no-op iterations before propagating the error. The realistic ceiling is "indefinite until the worker is killed externally" — a single hostile payload pins a CPU core until the process is OOM-killed, deadline-cancelled, or terminated. Remote, unauthenticated denial-of-service. This vulnerability is fixed in 2.33.0.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
65
EG Risk 65/100

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
Severity75% × 45%
Exploitation40% × 40%
Automatability100% × 15%
EPSS PROB
0.9%
EPSS %ILE
57th
KEV
Not listed

Published

May 18, 2026

Last Modified

September 9, 2026

Advisory Details (1)

Auto-updated Jun 2, 2026
Patch available. Sources: github.
github Patch Available

CPU Exhaustion in Avro Decoder via Unbounded Block-Count Iteration · Advisory · iskorotkov/avro · GitHub

https://github.com/iskorotkov/avro/security/advisories/GHSA-w8j3-pq8g-8m7w

Vendor Advisories for CVE-2026-46385(13)

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

Patch Availability(10)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatrhacm2/acm-grafana-rhel9:17873164672026-08-26redhat
redhatrhacm2/acm-grafana-rhel9:17869089682026-08-19redhat
redhatmulticluster-globalhub/multicluster-globalhub-grafana-rhel9:17854428722026-08-11redhat
redhatcryostat/cryostat-storage-rhel9:4.2.0-192026-07-29redhat
redhatmulticluster-globalhub/multicluster-globalhub-grafana-rhel9:17849066282026-07-28redhat
redhatmulticluster-globalhub/multicluster-globalhub-grafana-rhel9:17845613762026-07-23redhat
redhatmulticluster-globalhub/multicluster-globalhub-grafana-rhel9:17845620602026-07-21redhat
redhatmulticluster-globalhub/multicluster-globalhub-grafana-rhel9:17840606812026-07-16redhat
redhatrhacm2/acm-grafana-rhel9:17835788472026-07-16redhat
redhatrhacm2/acm-grafana-rhel9:17823837302026-06-28redhat

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.

Affected Packages

(2 across 1 ecosystem)
Go(2)
PackageVulnerable rangeFix by version rangeDependents
github.com/hamba/avro/v2—
  • every version on: no fix on record
—
github.com/iskorotkov/avro/v2—
  • every version up to 2.33.0: fixed in 2.33.0
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 4× in last 7d / 29× 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 230 total refreshes for this CVE.

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

Related CVEs(same product + same vendor + same CWE)

Same product

2 shown

Go:github.com/iskorotkov/avro/v2 · Go:github.com/hamba/avro/v2

Frequently asked(5)

What is CVE-2026-46385?
CVE-2026-46385 is a high vulnerability published on May 18, 2026. iskorotkov/avro is a fast Go Avro codec. Prior to 2.33.0, the Avro array and map decoders looped over an attacker-controlled block-count value without checking the underlying reader's error state inside the loop body. Reader.ReadBlockHeader returns the count as a Go int, which is 64-bit on amd64 /…
When was CVE-2026-46385 disclosed?
CVE-2026-46385 was first published on May 18, 2026, with the most recent update on September 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-46385 actively exploited?
CVE-2026-46385 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.9% probability of exploitation in the next 30 days (57th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-46385?
CVE-2026-46385 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-46385?
A fix for CVE-2026-46385 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-46385 are linked in the Vendor Advisories panel on this page.

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