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CVE-2026-42246 high CVSS 7.4

Vulnerability in net-imap (CVE-2026-42246)

Summary

vulnerability in net-imap (CVE-2026-42246). Confidential information can be exposed externally. Exploitable via ``STARTTLS``. Mitigation: upgrade to `0.3.10` or later.

AI summary snake-internal / snake-material-v2

A vulnerability tracked as **CVE-2026-42246** has been found in net-imap. Attackers can target a specific entry point like ``STARTTLS`` over the network to misuse the product. Confidential information can be exposed externally. CVSS score: 7.4/10. What to do: upgrade net-imap to **0.3.10** or later. If unsure, ask your IT team or search "net-imap CVE-2026-42246" on the vendor's site.
CVE-2026-42246 (net-imap) — CWE-392 / CVSS v3 7.4 Attack vector: remote (network-reachable) / unauthenticated / no user interaction Attack surface: `STARTTLS` / `true` Patched: `0.3.10` — 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-392) exists in net-imap. Attackers reach the vulnerable code path via ``STARTTLS`` without authentication.
📍 Affected scope
net-imap — . Attack surface: `STARTTLS` / `true`.
🔥 Severity
Severity: High (CVSS 7.4/10). Confidential information can be exposed externally
🔧 How to fix
Update to **0.3.10**.
🛡️ 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 'net-imap' .` 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 'net-imap' . | 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 `net-imap` を grep し、稼働しているサービス・バージョンを把握する。

  2. 6
    Apply patch patch 
    Upgrade net-imap to 0.3.10

    ステージング環境で 0.3.10 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。

  3. 7
    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 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

rubygems net-imap
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.3.10"}]}]

References

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