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CVE-2026-42039 high CVSS 7.5

Vulnerability in axios (CVE-2026-42039)

Summary

vulnerability in axios (CVE-2026-42039). Risk of unauthorized operations or information disclosure. Exploitable via `POST /forward`. Mitigation: upgrade to `0.31.1` or later.

AI summary snake-internal / snake-material-v2

A vulnerability tracked as **CVE-2026-42039** has been found in axios. Attackers can target a specific entry point like `POST /forward` over the network to misuse the product. Risk of unauthorized operations or information disclosure. CVSS score: 7.5/10. What to do: upgrade axios to **0.31.1** or later. If unsure, ask your IT team or search "axios CVE-2026-42039" on the vendor's site.
CVE-2026-42039 (axios) — CWE-674 / CVSS v3 7.5 Attack vector: remote (network-reachable) / unauthenticated / no user interaction Attack surface: POST /forward / `stack` / `build` / `toFormData` Patched: `0.31.1` — 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-674) exists in axios. Attackers reach the vulnerable code path via `POST /forward` without authentication.
📍 Affected scope
axios — . Attack surface: POST /forward / `stack` / `build` / `toFormData`.
🔥 Severity
Severity: High (CVSS 7.5/10). Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **0.31.1**.
🛡️ 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 `POST /forward` requests with malformed payloads or SQL meta-characters. Run `grep -r 'axios' .` against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response Actions (7 steps)

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

  1. 1
    Identify exposure identify 
    grep -r 'axios' . | 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 `axios` を grep し、稼働しているサービス・バージョンを把握する。

  2. 3
    Hunt for indicators of compromise detect 
    grep 'POST /forward' /var/log/nginx/access.log | grep -E '(unusual_payload|sqli_pattern)'

    アクセスログで `POST /forward` への異常なリクエスト (不正な認証ヘッダ・SQLメタ文字)を過去 30〜90日分捜索。WAF/SIEM があれば該当パスのアラート発火履歴を確認。

  3. 6
    Apply patch patch 
    Upgrade axios to 0.31.1

    ステージング環境で 0.31.1 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と、Step 3 で見つけた異常検知の続報チェックを含めること。

  4. 7
    Post-deployment verification verify 
    Replay attack against POST /forward on staging to confirm patch closes the vector

    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 Step 3 と同じログクエリでアラート再発が無いか継続監視。

Affected packages

npm axios
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.31.1"}]}]

References

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