CVE-2026-34550

// PoC for CVE-2026-34550: Integer conversion to size_t // This demonstrates the Undefined Behavior (UB) described. // The actual trigger requires a specific malformed ICC profile input // that leads to a negative value being read and used as a size. #include <iostream> #include <vector> #include <cstddef> // Simulated vulnerable function pattern based on description void processICCData(int tagCount) { // Vulnerable: Implicit conversion from signed 'int' to unsigned 'size_t' // If tagCount is negative, it becomes a huge positive number. size_t bufferSize = tagCount; std::cout << "Input tagCount: " << tagCount << std::endl; std::cout << "Converted bufferSize: " << bufferSize << std::endl; // This allocation might fail or consume all memory try { std::vector<char> buffer(bufferSize); std::cout << "Allocation attempted." << std::endl; } catch (const std::bad_alloc& e) { std::cerr << "Memory allocation failed (DoS triggered)." << std::endl; } } int main() { // Simulate a negative value read from a crafted ICC file int maliciousInput = -1; processICCData(maliciousInput); return 0; }

{"cve": {"id": "CVE-2026-34550", "sourceIdentifier": "[email protected]", "published": "2026-03-31T23:17:09.933", "lastModified": "2026-04-20T14:33:21.363", "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, there is an Undefined Behavior (UB) condition in IccProfLib/IccIO.cpp caused by an implicit conversion from a negative signed integer to size_t (unsigned), which changes the value. 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, existe una condición de Comportamiento Indefinido (UB) en IccProfLib/IccIO.cpp causada por una conversión implícita de un entero con signo negativo a size_t (sin signo), lo que cambia el valor. 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-681"}]}], "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/718", "source": "[email protected]", "tags": ["Issue Tracking", "Exploit"]}, {"url": "https://github.com/InternationalColorConsortium/iccDEV/pull/727", "source": "[email protected]", "tags": ["Issue Tracking", "Patch"]}, {"url": "https://github.com/InternationalColorConsortium/iccDEV/security/advisories/GHSA-rmxp-pxf4-p7wm", "source": "[email protected]", "tags": ["Patch", "Vendor Advisory"]}]}}