CVE-2026-46384

HIGHPre-NVD 7.58.7▲
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.7 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 77% 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: cna:github_m, epss
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.5Exploit: NoneExposed: 0

A fix is available — apply it.

iskorotkov/avro is a fast Go Avro codec. Prior to 2.33.0, several Avro decoder paths read attacker-controlled 64-bit values from the wire format and either narrowed them to platform-sized int before bounds-checking, or summed them with overflow-prone signed-int arithmetic. On 32-bit targets (GOARCH=386, arm, mips, wasm, etc.), the truncation paths can silently bypass byte-slice limits, select the wrong union branch, or hit the OCF negative-make panic via wrap. Three sub-issues are not 32-bit-specific: cumulative-size arithmetic overflow in arrayDecoder.Decode / mapDecoder.Decode / mapDecoderUnmarshaler.Decode (wraps at math.MaxInt64 on amd64 / arm64 and bypasses MaxSliceAllocSize / MaxMapAllocSize), math.MinInt negation in block-header handling, and make([]byte, size) with a negative size in OCF block reads — all three panic or bypass caps on any platform, giving an attacker a denial-of-service primitive there. This vulnerability is fixed in 2.33.0.

CVSS v3
7.5
EG Score
8.7(medium)
EPSS
31.7%
KEV
Not listed

Published

May 18, 2026

Last Modified

June 30, 2026

Advisory Details (1)

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

Integer Overflow in Avro Decoder · Advisory · iskorotkov/avro · GitHub

https://github.com/iskorotkov/avro/security/advisories/GHSA-mc57-h6j3-3hmv

Vendor Advisories for CVE-2026-46384(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
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

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFixed inDependents
github.com/iskorotkov/avro/v2—2.33.0—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 66× 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.

  1. 2026-07-06 16:27 UTCEPSS rescore
  2. 2026-07-06 02:23 UTCEPSS rescore
  3. 2026-07-05 02:30 UTCEPSS rescore
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  5. 2026-07-01 15:07 UTCEPSS rescore
  6. 2026-06-30 23:22 UTCEPSS rescore
  7. 2026-06-30 04:33 UTCNVD updateCVSS v3 → 7.5
  8. 2026-06-29 21:10 UTCEG score recompute
  9. 2026-06-29 21:10 UTCVendor advisory
  10. 2026-06-29 14:06 UTCEPSS rescore
  11. 2026-06-29 14:06 UTCEPSS rescore
  12. 2026-06-28 14:07 UTCEPSS rescore
  13. 2026-06-28 11:23 UTCEG score recompute
  14. 2026-06-28 04:56 UTCEPSS rescore
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  16. 2026-06-27 22:17 UTCEG score recompute
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  19. 2026-06-26 19:56 UTCEG score recompute
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  21. 2026-06-25 13:49 UTCEPSS rescore
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  1. 2026-06-22 14:25 UTCEPSS rescore
  2. 2026-06-21 14:56 UTCEPSS rescore
  3. 2026-06-21 14:56 UTCEPSS rescore
  4. 2026-06-21 01:59 UTCEPSS rescore
  5. 2026-06-21 01:59 UTCEPSS rescore
  6. 2026-06-19 19:26 UTCEPSS rescore
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  8. 2026-06-18 17:52 UTCEPSS rescore
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  10. 2026-06-18 02:22 UTCEG score recompute
  11. 2026-06-17 17:53 UTCEPSS rescore
  12. 2026-06-17 13:15 UTCEG score recompute
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  14. 2026-06-16 17:53 UTCEPSS rescore
  15. 2026-06-15 23:11 UTCEG score recompute
  16. 2026-06-15 17:49 UTCEPSS rescore
  17. 2026-06-15 01:05 UTCEG score recompute
  18. 2026-06-14 11:59 UTCEG score recompute
  19. 2026-06-13 23:00 UTCEPSS rescore
  20. 2026-06-13 22:54 UTCEG score recompute
  21. 2026-06-13 05:40 UTCEG score recompute
  22. 2026-06-12 23:12 UTCEPSS rescore
  23. 2026-06-12 23:12 UTCEPSS rescore
  24. 2026-06-12 16:25 UTCEG score recompute
  25. 2026-06-12 03:18 UTCEG score recompute
  26. 2026-06-11 14:12 UTCEG score recompute
  27. 2026-06-11 14:00 UTCEPSS rescore
  28. 2026-06-11 01:06 UTCEG score recompute
  29. 2026-06-10 22:18 UTCEPSS rescore
  30. 2026-06-10 13:22 UTCEPSS rescore
  31. 2026-06-10 13:22 UTCEPSS rescore
  32. 2026-06-10 12:00 UTCEG score recompute
  33. 2026-06-09 22:54 UTCEG score recompute
  34. 2026-06-09 09:49 UTCEG score recompute
  35. 2026-06-08 20:43 UTCEG score recompute
  36. 2026-06-08 14:17 UTCEPSS rescore
  37. 2026-06-08 14:17 UTCEPSS rescore
  38. 2026-06-08 07:37 UTCEG score recompute
  39. 2026-06-07 18:31 UTCEG score recompute
  40. 2026-06-07 15:25 UTCEPSS rescore
  41. 2026-06-07 15:25 UTCEPSS rescore
  42. 2026-06-07 05:24 UTCEG score recompute
  43. 2026-06-06 16:17 UTCEG score recompute
  44. 2026-06-06 13:47 UTCEPSS rescore
  45. 2026-06-06 13:47 UTCEPSS rescore
  46. 2026-06-06 03:10 UTCEG score recompute
  47. 2026-06-05 22:47 UTCEPSS rescore
  48. 2026-06-05 14:04 UTCEG score recompute
  49. 2026-06-05 06:10 UTCEPSS rescore
  50. 2026-06-05 06:10 UTCEPSS rescore
  51. 2026-06-05 00:58 UTCEG score recompute
  52. 2026-06-04 13:12 UTCEPSS rescore
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  54. 2026-06-04 11:52 UTCEG score recompute
  55. 2026-06-03 22:46 UTCEG score recompute
  56. 2026-06-03 09:40 UTCEG score recompute
  57. 2026-06-02 20:34 UTCEG score recompute
  58. 2026-06-02 20:13 UTCEPSS rescore
  59. 2026-06-02 07:28 UTCEG score recompute
  60. 2026-06-01 18:22 UTCEG score recompute
  61. 2026-06-01 13:52 UTCEPSS rescore
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  63. 2026-06-01 05:16 UTCEG score recompute▲ 1.20
  64. 2026-05-31 22:30 UTCEPSS rescore
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  66. 2026-05-31 00:16 UTCEPSS rescore
  67. 2026-05-31 00:16 UTCEPSS rescore
  68. 2026-05-24 06:17 UTCEG score recompute

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-46384?
CVE-2026-46384 is a high vulnerability published on May 18, 2026. iskorotkov/avro is a fast Go Avro codec. Prior to 2.33.0, several Avro decoder paths read attacker-controlled 64-bit values from the wire format and either narrowed them to platform-sized int before bounds-checking, or summed them with overflow-prone signed-int arithmetic. On 32-bit targets…
When was CVE-2026-46384 disclosed?
CVE-2026-46384 was first published in the National Vulnerability Database on May 18, 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-2026-46384 actively exploited?
CVE-2026-46384 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 31.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-46384?
CVE-2026-46384 has a CVSS v3 base score of 7.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 8.7.
How do I remediate CVE-2026-46384?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-46384, 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.

Dependency Blast Radius

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