static int get_crl_sk(X509_STORE_CTX *ctx, X509_CRL **pcrl, X509_CRL **pdcrl,
                      X509 **pissuer, int *pscore, unsigned int *preasons,
                      STACK_OF(X509_CRL) *crls)
{
    int i, crl_score, best_score = *pscore;
    unsigned int reasons, best_reasons = 0;
    X509 *x = ctx->current_cert;
    X509_CRL *crl, *best_crl = NULL;
    X509 *crl_issuer = NULL, *best_crl_issuer = NULL;

    for (i = 0; i < sk_X509_CRL_num(crls); i++) {
        crl = sk_X509_CRL_value(crls, i);
        reasons = *preasons;
        crl_score = get_crl_score(ctx, &crl_issuer, &reasons, crl, x);

        if (crl_score > best_score) {
            best_crl = crl;
            best_crl_issuer = crl_issuer;
            best_score = crl_score;
            best_reasons = reasons;
        }
    }

    if (best_crl) {
        if (*pcrl)
            X509_CRL_free(*pcrl);
        *pcrl = best_crl;
        *pissuer = best_crl_issuer;
        *pscore = best_score;
        *preasons = best_reasons;
        CRYPTO_add(&best_crl->references, 1, CRYPTO_LOCK_X509_CRL);
        if (*pdcrl) {
            X509_CRL_free(*pdcrl);
            *pdcrl = NULL;
        }
        get_delta_sk(ctx, pdcrl, pscore, best_crl, crls);
    }

    if (best_score >= CRL_SCORE_VALID)
        return 1;

    return 0;
}

This label identifies security gaps where expected security features are missing or only partially implemented, reducing protection against unauthorized access or manipulation.