CVE-2026-34672

# Proof of Concept for Integer Underflow (DoS) # This script simulates the logic that leads to a crash due to memory allocation issues. def process_data(input_size): # Simulating vulnerable code: input_size is trusted and used in calculation # If input_size is small, e.g., 5, the subtraction causes an underflow in unsigned context # Here we simulate the impact of such a wraparound try: # Vulnerable logic simulation # In a real scenario, this might be: new_size = size - header_length if input_size < 20: print(f"Input size too small, attempting risky operation...") # Simulating wraparound to a huge number # (e.g. 5 - 10 in 32-bit unsigned int becomes a huge number) allocated_size = (input_size - 10) % (2**32) print(f"Attempting to allocate {allocated_size} bytes...") # This allocation attempt will likely cause MemoryError or crash the app dummy_buffer = ['A'] * allocated_size print("Operation successful (unexpected)") else: print("Safe operation") except MemoryError: print("Application crashed: Out of Memory (DoS triggered)") except Exception as e: print(f"Application crashed: {e}") # Triggering the vulnerability with a small input that causes underflow process_data(5)

{"cve": {"id": "CVE-2026-34672", "sourceIdentifier": "[email protected]", "published": "2026-05-12T20:16:37.807", "lastModified": "2026-05-13T14:49:11.830", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "CAI Content Credentials versions 0.78.2, 0.7.0 and earlier are affected by an Integer Underflow (Wrap or Wraparound) vulnerability that could result in an application denial-of-service. An attacker could exploit this vulnerability to crash the application, leading to a denial-of-service condition. Exploitation of this issue does not require user interaction."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 6.2, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.5, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-191"}]}], "references": [{"url": "https://helpx.adobe.com/security/products/content-authenticity-sdk/apsb26-53.html", "source": "[email protected]"}]}}