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CVE-2026-46384 high CVSS 7.5

Vulnerability in github.com/iskorotkov/avro/v2 (CVE-2026-46384)

Summary

Vulnerability in github.com/iskorotkov/avro/v2 (CVE-2026-46384). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 2.33.0 or later.

Original description

The description as published by the source.

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, the truncation paths can silently bypass byte-slice limits, select the wrong union branch, or hit a negative-make panic via wrap.

Three sub-issues are not 32-bit-specific: cumulative-size arithmetic overflow in array and map decoders, negation of MinInt in block-header handling, and negative size in block reads. All three panic or bypass caps on any platform, giving an attacker a denial-of-service primitive. Exploitation requires only an untrusted Avro stream.

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-2026-46384 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-2026-46384" on the vendor's site.

CVE-2026-46384 (github.com/iskorotkov/avro/v2) — CWE-190 / 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-190) 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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