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CVE-2026-73678 critical CVSS 10.0

Code Injection in c (CVE-2026-73678)

Summary

code injection in c (CVE-2026-73678). Successful exploitation can lead to full system takeover. Exploitable via `POST /api/v1/responses/`.

AI summary snake-internal / snake-material-v2

A vulnerability tracked as **CVE-2026-73678** has been found in c. Attackers can target a specific entry point like `POST /api/v1/responses/` over the network to misuse the product. Successful exploitation can lead to full system takeover. CVSS score: 10.0/10. What to do: apply the vendor's official patched release. If unsure, ask your IT team or search "c CVE-2026-73678" on the vendor's site.
CVE-2026-73678 (c) — CWE-94 / CVSS v3 10.0 Attack vector: remote (network-reachable) / unauthenticated / no user interaction Attack surface: POST /api/v1/responses/ / PUT /api/v1/settings/ 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
**arbitrary code execution** (CWE-94) exists in c. Attackers reach the vulnerable code path via `POST /api/v1/responses/` without authentication.
📍 Affected scope
c — . Attack surface: POST /api/v1/responses/ / PUT /api/v1/settings/.
🔥 Severity
Severity: Critical (CVSS 10.0/10). Successful exploitation can lead to full system takeover
🔧 How to fix
Update to the patched release per vendor advisory.
🛡️ 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 /api/v1/responses/` requests with malformed payloads or SQL meta-characters. Run `grep -r 'c' .` 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 'c' . | 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 `c` 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 /api/v1/responses/' /var/log/nginx/access.log | grep -E '(unusual_payload|sqli_pattern)'

    アクセスログで `POST /api/v1/responses/` 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. 7
    Post-deployment verification verify 
    Replay attack against POST /api/v1/responses/ 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。

References

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