Vulnerability in github.com/f1bonacc1/process-compose (CVE-2026-77339)
Summary
Vulnerability in github.com/f1bonacc1/process-compose (CVE-2026-77339). Risk of unauthorized operations or information disclosure. Exploitable via GET /sse. Mitigation: upgrade to 1.120.0 or later.
Original description
The description as published by the source.
Summary
A malicious website can use DNS rebinding to control a developer's local process-compose MCP SSE listener when MCP SSE is enabled. The vulnerable path accepts browser-origin requests before any Host validation, Origin validation, or caller-secret check, then dispatches the requests into process-compose MCP tools.
This advisory covers https://github.com/F1bonacc1/process-compose, confirmed at commit d56aa59df04b72f8644811ac581a051bec05e485.
The issue is in the MCP SSE transport, not the Gin REST API. The REST API token middleware protects REST routes, but the MCP listener is started separately and does not inherit that protection.
Affected Code
Root cause:
src/types/mcp.go:24-30 SSE is the default MCP transport when mcp_server.transport is omitted.
src/types/mcp.go:64-70 SSE configuration requires only host and port. There is no auth, Host allowlist, Origin allowlist, or caller-secret field.
src/mcp/server.go:203-214 The server starts server.NewSSEServer(s.mcpServer) directly on the configured address.
src/api/routes.go:32-39 X-PC-Token-Key middleware is installed on the Gin REST router, not on the MCP SSE listener.
Impact surface:
src/mcp/mcp_manager.go:33-38 expose_control_tools registers built-in process-compose control tools.
src/mcp/control_tools.go:26-116 The registered tools start, stop, restart, scale, read logs, search logs, and truncate logs.
src/mcp/control_tools.go:121-142 The registered tools retur…
Source: NIST National Vulnerability Database 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-2026-77339 has been found in github.com/f1bonacc1/process-compose.
Attackers can target a specific entry point like GET /sse over the network to misuse the product.
Risk of unauthorized operations or information disclosure.
What to do: upgrade github.com/f1bonacc1/process-compose to 1.120.0 or later.
If unsure, ask your IT team or search "github.com/f1bonacc1/process-compose CVE-2026-77339" on the vendor's site.
CVE-2026-77339 (github.com/f1bonacc1/process-compose) — CWE-306
Attack surface: GET /sse / d56aa59df04b72f8644811ac581a051bec05e485 / initialize / pc_process_list
Patched: 1.120.0 — 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.
A vulnerability (CWE-306) exists in github.com/f1bonacc1/process-compose. Attackers reach the vulnerable code path via GET /sse.
Check the vendor advisory for the affected versions of github.com/f1bonacc1/process-compose. Attack surface: GET /sse / d56aa59df04b72f8644811ac581a051bec05e485 / initialize / pc_process_list.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to 1.120.0.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual GET /sse requests with malformed payloads or SQL meta-characters. Run grep -r 'github.com/f1bonacc1/process-compose' . 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
-
1Identify exposure identify
grep -r 'github.com/f1bonacc1/process-compose' . | 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/f1bonacc1/process-composeを grep し、稼働しているサービス・バージョンを把握する。 -
2Hunt for indicators of compromise detect
grep 'GET /sse' /var/log/nginx/access.log | grep -E '(unusual_payload|sqli_pattern)'アクセスログで
GET /sse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。 -
3Apply patch patch
Upgrade github.com/f1bonacc1/process-compose to 1.120.0ステージング環境で 1.120.0 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と、Step 2 で見つけた異常検知の続報チェックを含めること。
-
4Post-deployment verification verify
Replay attack against GET /sse 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 2 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
References
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