The following code is for security research and authorized testing only.
python
/*
* 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;
}