CVE-2026-9605

# PoC for CVE-2026-9605 (Heap Buffer Overflow in GNU libredwg) # This script demonstrates the vulnerability by attempting to process a crafted DWG file. # Note: The actual malicious binary file is required to trigger the overflow. import subprocess import os # Path to the vulnerable dwgbmp utility VULNERABLE_BIN = "/usr/local/bin/dwgbmp" # Crafted malicious file path (simulated) MALICIOUS_FILE = "exploit.dwg" def trigger_overflow(): """ Trigger the heap-based buffer overflow in bit_read_RC function. """ if not os.path.exists(MALICIOUS_FILE): print(f"[*] Creating dummy malicious file: {MALICIOUS_FILE}") # In a real scenario, this file would contain specific bit manipulation # to cause the overflow in bits.c:bit_read_RC. with open(MALICIOUS_FILE, "wb") as f: f.write(b"malicious_payload_placeholder") print(f"[*] Executing vulnerable utility with malicious file...") try: # The overflow occurs when parsing the compressed section or BMP data result = subprocess.run([VULNERABLE_BIN, MALICIOUS_FILE], capture_output=True, text=True) print("[*] Output:", result.stdout) print("[*] Error:", result.stderr) except Exception as e: print(f"[!] An exception occurred: {e}") if __name__ == "__main__": trigger_overflow()

{"cve": {"id": "CVE-2026-9605", "sourceIdentifier": "[email protected]", "published": "2026-05-27T00:16:39.157", "lastModified": "2026-05-27T14:50:47.627", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "A flaw has been found in GNU libredwg up to 0.13.4.8160. This issue affects the function bit_read_RC of the file bits.c of the component Dwgbmp Utility. This manipulation causes heap-based buffer overflow. The attack is possible to be carried out remotely. The exploit has been published and may be used. Patch name: 8f03865f37f5d4ffd616fef802acc980be54d300. 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:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/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": 5.5, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "LOW", "vulnAvailabilityImpact": "LOW", "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:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L", "baseScore": 7.3, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "LOW"}, "exploitabilityScore": 3.9, "impactScore": 3.4}], "cvssMetricV2": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "2.0", "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P", "baseScore": 7.5, "accessVector": "NETWORK", "accessComplexity": "LOW", "authentication": "NONE", "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "availabilityImpact": "PARTIAL"}, "baseSeverity": "HIGH", "exploitabilityScore": 10.0, "impactScore": 6.4, "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-122"}]}], "references": [{"url": "https://github.com/HackC0der/CVE-Repos/blob/main/libredwg/libredwg_6d6a339_heap_oob_write_read_2004_compressed_section.dwg", "source": "[email protected]"}, {"url": "https://github.com/LibreDWG/libredwg/commit/8f03865f37f5d4ffd616fef802acc980be54d300", "source": "[email protected]"}, {"url": "https://github.com/LibreDWG/libredwg/issues/1248", "source": "[email protected]"}, {"url": "https://vuldb.com/submit/818197", "source": "[email protected]"}, {"url": "https://vuldb.com/vuln/365678", "source": "[email protected]"}, {"url": "https://vuldb.com/vuln/365678/cti", "source": "[email protected]"}, {"url": "https://www.gnu.org/", "source": "[email protected]"}]}}