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CVE-2026-46385 high CVSS 7.5

Vulnerability in github.com/iskorotkov/avro/v2 (CVE-2026-46385)

Summary

Vulnerability in github.com/iskorotkov/avro/v2 (CVE-2026-46385). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 2.33.0 or later.

Original description

The description as published by the source.

The Avro array and map decoders loop 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 and arm64 targets. A producer can declare a block of up to math.MaxInt64 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, resulting in a remote, unauthenticated denial-of-service.

The fix exits the loop on the first inner-decode error.

Source: GitHub Security Advisories (Global) NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-46385 has been found in github.com/iskorotkov/avro/v2.
Risk of unauthorized operations or information disclosure. CVSS score: 7.5/10.
What to do: upgrade github.com/iskorotkov/avro/v2 to 2.33.0 or later.
If unsure, ask your IT team or search "github.com/iskorotkov/avro/v2 CVE-2026-46385" on the vendor's site.

CVE-2026-46385 (github.com/iskorotkov/avro/v2) — CWE-400 / CVSS v3 7.5
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: 2.33.0 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

A vulnerability (CWE-400) exists in github.com/iskorotkov/avro/v2.

📍 Affected scope

Check the vendor advisory for the affected versions of github.com/iskorotkov/avro/v2.

🔥 Severity

Severity: High (CVSS 7.5/10). Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to 2.33.0.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'github.com/iskorotkov/avro/v2' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    grep -r 'github.com/iskorotkov/avro/v2' . | grep -v node_modules

    リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で github.com/iskorotkov/avro/v2 を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Apply patch patch 
    Upgrade github.com/iskorotkov/avro/v2 to 2.33.0

    ステージング環境で 2.33.0 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。

  3. 3
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

go github.com/iskorotkov/avro/v2
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.33.0"}]}]
Go github.com/hamba/avro/v2
[{"type":"SEMVER","events":[{"introduced":"0"}]}]

References

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