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CVE-2026-42300

Vulnerability in github.com/l3montree-dev/devguard (CVE-2026-42300)

Summary

vulnerability in github.com/l3montree-dev/devguard (CVE-2026-42300). Risk of unauthorized operations or information disclosure. Exploitable via ``SessionMiddleware``. Mitigation: upgrade to `1.2.2` or later.

AI summary snake-internal / snake-material-v2

A vulnerability tracked as **CVE-2026-42300** has been found in github.com/l3montree-dev/devguard. Attackers can target a specific entry point like ``SessionMiddleware`` over the network to misuse the product. Risk of unauthorized operations or information disclosure. CVSS score: ?/10. What to do: upgrade github.com/l3montree-dev/devguard to **1.2.2** or later. If unsure, ask your IT team or search "github.com/l3montree-dev/devguard CVE-2026-42300" on the vendor's site.
CVE-2026-42300 (github.com/l3montree-dev/devguard) — CWE-288 / Attack surface: `SessionMiddleware` / `userID` / `admin` / `owner` Patched: `1.2.2` — apply immediately Workaround: Configure a reverse proxy to strip the `X-Admin-Token` header before sending requests to the DevGuard API. 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-288) exists in github.com/l3montree-dev/devguard. Attackers reach the vulnerable code path via ``SessionMiddleware`` without authentication.
📍 Affected scope
github.com/l3montree-dev/devguard — . Attack surface: `SessionMiddleware` / `userID` / `admin` / `owner`.
🔥 Severity
Severity: ?. Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **1.2.2**.
🛡️ Workaround
Workaround: Configure a reverse proxy to strip the `X-Admin-Token` header before sending requests to the DevGuard API.
🔍 Detection
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run `grep -r 'github.com/l3montree-dev/devguard' .` 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 'github.com/l3montree-dev/devguard' . | 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/l3montree-dev/devguard` を grep し、稼働しているサービス・バージョンを把握する。

  2. 5
    Apply temporary workaround mitigate
    Configure a reverse proxy to strip the `X-Admin-Token` header before sending requests to the DevGuard API.

    パッチが適用されるまでの応急処置として、Configure a reverse proxy to strip the `X-Admin-Token` header before sending requests to the DevGuard API. を実施。回避策の副作用 (機能低下) を確認した上で。

  3. 6
    Apply patch patch
    Upgrade github.com/l3montree-dev/devguard to 1.2.2

    ステージング環境で 1.2.2 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
    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

go github.com/l3montree-dev/devguard
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2.2"}]}]

References

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