CVE-2026-41990 Libgcrypt Dilithium签名越界写入漏洞

/* * PoC for CVE-2026-41990 (Conceptual) * Vulnerability: Libgcrypt before 1.12.2 mishandles Dilithium signing. * Issue: Writes to a static array lack a bounds check. * Note: The write does not use attacker-controlled data, so this PoC * demonstrates the context of the vulnerability rather than an exploit. */ #include <stdio.h> #include <gcrypt.h> int main() { // Check if vulnerable version is present (e.g., 1.12.1) if (!gcry_check_version ("1.12.1")) { printf("Libgcrypt version check failed or not vulnerable version."); return 1; } gcry_control (GCRYCTL_INITIALIZATION_FINISHED, 0); printf("Libgcrypt initialized. Testing Dilithium signing context...\n"); // To actually trigger the bug, one would need to generate keys // and perform signing operations that hit the specific code path // where the static array overflow occurs. // Since the data is not attacker-controlled, the impact is limited. printf("PoC execution completed. Monitor for crashes/corruption."); return 0; }