CVE-2026-21494

#include <stdio.h> #include <stdlib.h> #include <string.h> // This is a conceptual PoC for CVE-2026-21494 // Heap buffer overflow in CIccTagLut8::Validate() // Target: iccDEV library versions < 2.3.1.2 /* To trigger this vulnerability: 1. Create or modify an ICC profile with a malformed LUT8 tag 2. The LUT8 tag data should have length fields that don't match 3. When CIccTagLut8::Validate() processes this data, it will read/write beyond allocated heap buffer boundaries The vulnerability occurs because Validate() doesn't properly check if the LUT data size matches the declared dimensions. Example malformed LUT8 data structure: - Input Table Length: 256 bytes allocated - Declared Input Entries: 512 (causing overflow read) - Output Table Length: 256 bytes allocated - Declared Output Entries: 512 (causing overflow write) Usage: 1. Generate a malicious ICC profile with this malformed LUT8 tag 2. Open the profile using any application using iccDEV library 3. The application will crash or potentially allow code execution */ int main() { printf("CVE-2026-21494 PoC - Conceptual demonstration\n"); printf("Target: iccDEV CIccTagLut8::Validate()\n"); printf("Vulnerability: Heap buffer overflow\n"); printf("\nThis PoC requires creating a malformed ICC profile\n"); printf("with oversized LUT8 tag data to trigger the overflow.\n"); return 0; }

{"cve": {"id": "CVE-2026-21494", "sourceIdentifier": "[email protected]", "published": "2026-01-06T19:16:09.077", "lastModified": "2026-01-12T18:29:53.877", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "iccDEV provides a set of libraries and tools that allow for the interaction, manipulation, and application of International Color Consortium (ICC) color management profiles. A vulnerability present in versions prior to 2.3.1.2 affects users of the iccDEV library who process ICC color profiles. It results in heap buffer overflow in `CIccTagLut8::Validate()`. Version 2.3.1.2 contains a patch. No known workarounds are available."}, {"lang": "es", "value": "iccDEV proporciona un conjunto de bibliotecas y herramientas que permiten la interacción, manipulación y aplicación de perfiles de gestión de color del International Color Consortium (ICC). Una vulnerabilidad presente en versiones anteriores a la 2.3.1.2 afecta a los usuarios de la biblioteca iccDEV que procesan perfiles de color ICC. Resulta en desbordamiento de búfer de montón en 'CIccTagLut8::Validate()'. La versión 2.3.1.2 contiene un parche. No se conocen soluciones alternativas disponibles."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H", "baseScore": 6.1, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 4.2}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 5.2}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-122"}, {"lang": "en", "value": "CWE-125"}, {"lang": "en", "value": "CWE-193"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:color:iccdev:*:*:*:*:*:*:*:*", "versionEndExcluding": "2.3.1.2", "matchCriteriaId": "D34CF745-E75A-4F1C-AD7B-9AC1A2E9F680"}]}]}], "references": [{"url": "https://github.com/InternationalColorConsortium/iccDEV/commit/7c2cb719a9de1c00844e457e070d657314383ee3", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/InternationalColorConsortium/iccDEV/commit/e91fe722ac54ce497d410153e7405090e0565d7b", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/InternationalColorConsortium/iccDEV/issues/398", "source": "[email protected]", "tags": ["Issue Tracking", "Vendor Advisory"]}, {"url": "https://github.com/InternationalColorConsortium/iccDEV/security/advisories/GHSA-hjxv-xr7w-84fc", "source": "[email protected]", "tags": ["Patch", "Vendor Advisory"]}]}}