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CVE-2026-77602 critical CVSS 9.9

Code Injection in openc3 (CVE-2026-77602)

Summary

Code injection in openc3 (CVE-2026-77602). Successful exploitation can lead to full system takeover. Exploitable via ConfigParser. Mitigation: upgrade to 7.3.0 or later.

Original description

The description as published by the source.

Summary

COSMOS reads configuration from a user-writable overlay (targets_modified/) before the read-only plugin-installed targets/ tree, and the config subsystem executes code on those files: ConfigParser renders every file as ERB by default, a GENERIC_READ_CONVERSION / GENERIC_WRITE_CONVERSION block is evaluated as code by GenericConversion (Ruby and Python), and the Script Runner suite analysis requires a procedure file. An authenticated user can write into targets_modified/ below the admin tier (the storage-upload endpoint exempts that area from the admin gate, and the screen-save endpoint stores its body verbatim there), so the same root cause is reachable through several features, each giving arbitrary code execution on a COSMOS server.

Three vulnerable routes were identified, all reachable by an authenticated non-admin user (in the open-source edition authorize ignores the permission string, so any authenticated user qualifies):

  1. Table definitions (immediate). tables#generate|report|load reads a definition from targets_modified/ and ERB-renders it and evaluates its GENERIC_*_CONVERSION block in the cmd-tlm-api container.
  2. Command/telemetry definitions (persistent). A file written to targets_modified//cmd_tlm/ is overlaid by System.setup_targets and processed by PacketConfig in the decom/multi microservices: ERB-rendered in the Ruby implementation, and GENERIC-evaluated in both the Ruby and Python implementations (the Py…

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-2026-77602 has been found in openc3.
Attackers can target a specific entry point like ConfigParser over the network to misuse the product.
Successful exploitation can lead to full system takeover. CVSS score: 9.9/10.
What to do: upgrade openc3 to 7.3.0 or later.
If unsure, ask your IT team or search "openc3 CVE-2026-77602" on the vendor's site.

CVE-2026-77602 (openc3) — CWE-94 / CVSS v3 9.9
Attack vector: remote (network-reachable) / no user interaction
Attack surface: ConfigParser / GENERIC_READ_CONVERSION / GENERIC_WRITE_CONVERSION / GenericConversion
Patched: 7.3.0 — 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.

❓ What is the problem

Arbitrary code execution (CWE-94) exists in openc3. Attackers reach the vulnerable code path via ConfigParser.

📍 Affected scope

Check the vendor advisory for the affected versions of openc3. Attack surface: ConfigParser / GENERIC_READ_CONVERSION / GENERIC_WRITE_CONVERSION / GenericConversion.

🔥 Severity

Severity: Critical (CVSS 9.9/10). Successful exploitation can lead to full system takeover.

🔧 How to fix

Update to 7.3.0.

🛡️ 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 'openc3' . 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

  1. 1
    Identify exposure identify 
    grep -r 'openc3' . | 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 openc3 を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Apply patch patch 
    Upgrade openc3 to 7.3.0

    ステージング環境で 7.3.0 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を含めること。

  3. 3
    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。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

rubygems openc3
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.3.0"}]}]

References

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