Adyen has utility methods for validating notification HMAC signatures. The is_valid_hmac and is_valid_hmac_notification methods are vulnerable to a timing attack, you should compare the hash of the HMACs instead.
{
"nvd_published_at": null,
"github_reviewed": true,
"github_reviewed_at": "2024-08-30T18:51:58Z",
"cwe_ids": [
"CWE-347"
],
"severity": "MODERATE"
}