CVE-2026-46385

HIGHPre-NVD 7.58.7▲
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.7 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 79% 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, nvd
Elevated
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, 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
8.7(medium)
EPSS
29.8%
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

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(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(2)

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
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  12. 2026-06-28 14:07 UTCEPSS rescore
  13. 2026-06-28 11:35 UTCEG score recompute
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  1. 2026-06-22 14:25 UTCEPSS rescore
  2. 2026-06-21 14:56 UTCEPSS rescore
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  4. 2026-06-21 01:59 UTCEPSS rescore
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  10. 2026-06-18 02:26 UTCEG score recompute
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  20. 2026-06-13 22:52 UTCEG score recompute
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  22. 2026-06-12 23:12 UTCEPSS rescore
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  24. 2026-06-12 19:16 UTCEG score recompute
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  26. 2026-06-11 16:48 UTCEG score recompute
  27. 2026-06-11 14:00 UTCEPSS rescore
  28. 2026-06-11 02:40 UTCEG score recompute
  29. 2026-06-10 22:18 UTCEPSS rescore
  30. 2026-06-10 13:27 UTCEG score recompute
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  33. 2026-06-10 00:16 UTCEG score recompute
  34. 2026-06-09 11:04 UTCEG score recompute
  35. 2026-06-08 21:53 UTCEG score recompute
  36. 2026-06-08 14:17 UTCEPSS rescore
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  39. 2026-06-07 19:31 UTCEG score recompute
  40. 2026-06-07 15:25 UTCEPSS rescore
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  42. 2026-06-07 06:20 UTCEG score recompute
  43. 2026-06-06 17:09 UTCEG score recompute
  44. 2026-06-06 13:47 UTCEPSS rescore
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  46. 2026-06-06 03:57 UTCEG score recompute
  47. 2026-06-05 22:47 UTCEPSS rescore
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  49. 2026-06-05 06:10 UTCEPSS rescore
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  51. 2026-06-05 01:35 UTCEG score recompute
  52. 2026-06-04 13:12 UTCEPSS rescore
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  54. 2026-06-04 12:23 UTCEG score recompute
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  61. 2026-06-01 13:52 UTCEPSS rescore
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  63. 2026-06-01 05:15 UTCEG score recompute▲ 1.20
  64. 2026-05-31 22:30 UTCEPSS rescore
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  68. 2026-05-24 06:17 UTCEG score recompute

Related CVEs(same vendor + same CWE)

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 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-2026-46385 actively exploited?
CVE-2026-46385 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 29.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-46385?
CVE-2026-46385 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-2026-46385?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-46385, 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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